diff --git a/searx/templates/oscar/preferences.html b/searx/templates/oscar/preferences.html
index 33fb4106..352b90ee 100644
--- a/searx/templates/oscar/preferences.html
+++ b/searx/templates/oscar/preferences.html
@@ -25,11 +25,13 @@
 <td class="{{ label }}" style="padding: 2px">{{- "" -}}
     {%- if stats[engine_name].time != None -%}
     <span class="stacked-bar-chart-value">{{- stats[engine_name].time -}}</span>{{- "" -}}
-    <span class="stacked-bar-chart" aria-labelledby="{{engine_name}}_chart" aria-hidden="true">{{- "" -}}
+    <span class="stacked-bar-chart" aria-labelledby="{{engine_name}}_chart" aria-hidden="true">
+        {%- if max_rate95 is not none and max_rate95 > 0 -%}
         <span style="width: calc(max(2px, 100%*{{ (stats[engine_name].time / max_rate95)|round(3) }}))" class="stacked-bar-chart-median"></span>{{- "" -}}
         <span style="width: calc(100%*{{ ((stats[engine_name].rate80 - stats[engine_name].time) / max_rate95)|round(3) }})" class="stacked-bar-chart-rate80"></span>{{- "" -}}
         <span style="width: calc(100%*{{ ((stats[engine_name].rate95 - stats[engine_name].rate80) / max_rate95)|round(3) }})" class="stacked-bar-chart-rate95"></span>{{- "" -}}
-        <span class="stacked-bar-chart-rate100"></span>{{- "" -}}
+        <span class="stacked-bar-chart-rate100"></span>
+        {%- endif -%}
     </span>{{- "" -}}
     <div class="engine-tooltip text-left" role="tooltip" id="{{engine_name}}_graph">{{- "" -}}
         <p>{{ _('Median') }}: {{ stats[engine_name].time }}</p>{{- "" -}}
diff --git a/searx/templates/oscar/stats.html b/searx/templates/oscar/stats.html
index 94117b67..d9b2ab68 100644
--- a/searx/templates/oscar/stats.html
+++ b/searx/templates/oscar/stats.html
@@ -52,11 +52,11 @@
                                 {%- endif -%}
                             </td>
                             <td class="response-time">
-                                {%- if engine_stat.total -%}
+                                {%- if engine_stat.total is not none -%}
                                 <div class="bar-chart-value">{{- engine_stat.total | round(1) -}}</div>{{- "" -}}
                                 <div class="bar-chart-graph" aria-labelledby="{{engine_stat.name}}_time" aria-hidden="true">{{- "" -}}
-                                    <div class="bar-chart-serie1 bar{{ (100 * engine_stat.http / engine_stats.max_time)|round }}"></div>{{- "" -}}
-                                    <div class="bar-chart-serie2 bar{{ (100 * engine_stat.processing / engine_stats.max_time)|round }}"></div>{{- "" -}}
+                                    {% if engine_stat.http is not none and engine_stats.max_time %}<div class="bar-chart-serie1 bar{{ (100 * engine_stat.http / engine_stats.max_time)|round }}"></div>{%- endif -%}
+                                    {% if engine_stat.processing is not none and engine_stats.max_time %}<div class="bar-chart-serie2 bar{{ (100 * engine_stat.processing / engine_stats.max_time)|round }}"></div>{%- endif -%}
                                 </div>
                                 <div class="engine-tooltip text-left" role="tooltip" id="{{engine_stat.name}}_time">{{- "" -}}
                                     <table class="table table-striped">
@@ -69,19 +69,19 @@
                                         <tr>
                                             <th scope="col">{{ _('Median') }}</th>
                                             <td>{{ engine_stat.total }}</td>
-                                            <td>{{ engine_stat.http }}</td>
+                                            <td>{{ engine_stat.http or '' }}</td>
                                             <td>{{ engine_stat.processing }}</td>
                                         </tr>
                                         <tr>
                                             <th scope="col">{{ _('P80') }}</th>
                                             <td>{{ engine_stat.total_p80 }}</td>
-                                            <td>{{ engine_stat.http_p80 }}</td>
+                                            <td>{{ engine_stat.http_p80 or '' }}</td>
                                             <td>{{ engine_stat.processing_p80 }}</td>
                                         </tr>
                                         <tr>
                                             <th scope="col">{{ _('P95') }}</th>
                                             <td>{{ engine_stat.total_p95 }}</td>
-                                            <td>{{ engine_stat.http_p95 }}</td>
+                                            <td>{{ engine_stat.http_p95 or '' }}</td>
                                             <td>{{ engine_stat.processing_p95 }}</td>
                                         </tr>
                                     </table>
diff --git a/searx/templates/simple/preferences.html b/searx/templates/simple/preferences.html
index 6d33233c..e3b1545b 100644
--- a/searx/templates/simple/preferences.html
+++ b/searx/templates/simple/preferences.html
@@ -39,11 +39,13 @@
 <td class="{{ label }}" style="padding: 2px; width: 13rem;">{{- "" -}}
     {%- if stats[engine_name].time != None -%}
     <span class="stacked-bar-chart-value">{{- stats[engine_name].time -}}</span>{{- "" -}}
-    <span class="stacked-bar-chart" aria-labelledby="{{engine_name}}_chart" aria-hidden="true">{{- "" -}}
+    <span class="stacked-bar-chart" aria-labelledby="{{engine_name}}_chart" aria-hidden="true">
+        {%- if max_rate95 is not none and max_rate95 > 0 -%}
         <span style="width: calc(max(2px, 100%*{{ (stats[engine_name].time / max_rate95)|round(3) }}))" class="stacked-bar-chart-median"></span>{{- "" -}}
         <span style="width: calc(100%*{{ ((stats[engine_name].rate80 - stats[engine_name].time) / max_rate95)|round(3) }})" class="stacked-bar-chart-rate80"></span>{{- "" -}}
         <span style="width: calc(100%*{{ ((stats[engine_name].rate95 - stats[engine_name].rate80) / max_rate95)|round(3) }})" class="stacked-bar-chart-rate95"></span>{{- "" -}}
-        <span class="stacked-bar-chart-rate100"></span>{{- "" -}}
+        <span class="stacked-bar-chart-rate100"></span>
+        {%- endif -%}
     </span>{{- "" -}}
     <div class="engine-tooltip text-left" role="tooltip" id="{{engine_name}}_graph">{{- "" -}}
         <p>{{ _('Median') }}: {{ stats[engine_name].time }}</p>{{- "" -}}
diff --git a/searx/templates/simple/stats.html b/searx/templates/simple/stats.html
index 67c9c79c..7058d04d 100644
--- a/searx/templates/simple/stats.html
+++ b/searx/templates/simple/stats.html
@@ -52,12 +52,11 @@
             {%- endif -%}
         </td>
         <td class="response-time">
-            {%- if engine_stat.total -%}
-
+            {%- if engine_stat.total is not none -%}
             <div class="bar-chart-value">{{- engine_stat.total | round(1) -}}</div>{{- "" -}}
         <div class="bar-chart-graph" aria-labelledby="{{engine_stat.name}}_time" aria-hidden="true">
-              <div class="bar-chart-serie1 bar{{ (100 * engine_stat.http / engine_stats.max_time)|round }}"></div>{{- "" -}}
-              <div class="bar-chart-serie2 bar{{ (100 * engine_stat.processing / engine_stats.max_time)|round }}"></div>{{- "" -}}
+              {% if engine_stat.http is not none and engine_stats.max_time %}<div class="bar-chart-serie1 bar{{ (100 * engine_stat.http / engine_stats.max_time)|round }}"></div>{%- endif -%}
+              {% if engine_stat.processing is not none and engine_stats.max_time %}<div class="bar-chart-serie2 bar{{ (100 * engine_stat.processing / engine_stats.max_time)|round }}"></div>{%- endif -%}
         </div>
             <div class="engine-tooltip" role="tooltip" id="{{engine_stat.name}}_time">{{- "" -}}
                 <table>
@@ -70,19 +69,19 @@
                     <tr>
                         <th scope="col">{{ _('Median') }}</th>
                         <td>{{ engine_stat.total }}</td>
-                        <td>{{ engine_stat.http }}</td>
+                        <td>{{ engine_stat.http or ''}}</td>
                         <td>{{ engine_stat.processing }}</td>
                     </tr>
                     <tr>
                         <th scope="col">{{ _('P80') }}</th>
                         <td>{{ engine_stat.total_p80 }}</td>
-                        <td>{{ engine_stat.http_p80 }}</td>
+                        <td>{{ engine_stat.http_p80 or '' }}</td>
                         <td>{{ engine_stat.processing_p80 }}</td>
                     </tr>
                     <tr>
                         <th scope="col">{{ _('P95') }}</th>
                         <td>{{ engine_stat.total_p95 }}</td>
-                        <td>{{ engine_stat.http_p95 }}</td>
+                        <td>{{ engine_stat.http_p95 or '' }}</td>
                         <td>{{ engine_stat.processing_p95 }}</td>
                     </tr>
                 </table>