diff --git a/mubench/frontend/web/templates/visualize.html b/mubench/frontend/web/templates/visualize.html
index fe4e609b1277c7f64e6dc53d589ca0f49b4aefd5..402a98809899251d03aa7361a424e2a7aebf5d1a 100644
--- a/mubench/frontend/web/templates/visualize.html
+++ b/mubench/frontend/web/templates/visualize.html
@@ -58,9 +58,11 @@
                 var temp_yerr = [];
 
                 {% for task in ts["datapoints_grouped"] %}
-                    temp_x.push("{{ task }}");
-                    temp_y.push({{ ts["datapoints_grouped"][task][metric].mean }});
-                    temp_yerr.push({{ ts["datapoints_grouped"][task][metric].std }});
+                    {% if ts["datapoints_grouped"][task] %}
+                        temp_x.push("{{ task }}");
+                        temp_y.push({{ ts["datapoints_grouped"][task][metric].mean }});
+                        temp_yerr.push({{ ts["datapoints_grouped"][task][metric].std }});
+                    {% endif %}
                 {% endfor %}
                 var trace_{{ metric }} = {
                     x: temp_x,
@@ -86,13 +88,15 @@
                 var temp_x = [];
                 var temp_y = [];
                 {% for task in ts["datapoints_grouped"] %}
-                    var rawArr = {{ ts["datapoints_grouped"][task][metric].raw }};
-                    rawArr.forEach(
-                        function (val) {
-                            temp_x.push("{{ task }}");
-                            temp_y.push(val);
-                        }
-                    );
+                    {% if ts["datapoints_grouped"][task] %}
+                        var rawArr = {{ ts["datapoints_grouped"][task][metric].raw }};
+                        rawArr.forEach(
+                            function (val) {
+                                temp_x.push("{{ task }}");
+                                temp_y.push(val);
+                            }
+                        );
+                    {% endif %}
                 {% endfor %}
                 var trace_{{ metric }} = {
                     x: temp_x,
diff --git a/mubench/frontend/web/templates/visualize_summary.html b/mubench/frontend/web/templates/visualize_summary.html
index f1a143bbc6e7f968344ea164de42514c3f7c583e..11c319cae01aff329673bdfc9578b89ce77d0eaa 100644
--- a/mubench/frontend/web/templates/visualize_summary.html
+++ b/mubench/frontend/web/templates/visualize_summary.html
@@ -31,9 +31,11 @@
             var temp_yerr = [];
 
             {% for task in ts["datapoints_grouped"] %}
-                temp_x.push("{{ task }}");
-                temp_y.push({{ ts["datapoints_grouped"][task][metric].mean }});
-                temp_yerr.push({{ ts["datapoints_grouped"][task][metric].std }});
+                {% if ts["datapoints_grouped"][task] %}
+                    temp_x.push("{{ task }}");
+                    temp_y.push({{ ts["datapoints_grouped"][task][metric].mean }});
+                    temp_yerr.push({{ ts["datapoints_grouped"][task][metric].std }});
+                {% endif %}
             {% endfor %}
             var trace_{{ metric }} = {
                 x: temp_x,