solving error while representing linear chart

Dockerfile

 from node:7.10.0
 
+RUN printf "deb http://archive.debian.org/debian/ jessie main\ndeb-src http://archive.debian.org/debian/ jessie main\ndeb http://security.debian.org jessie/updates main\ndeb-src http://security.debian.org jessie/updates main" > /etc/apt/sources.list
+
 # Install gettext to get envsubst
 RUN apt-get update && apt-get install -y gettext
 

demo/elements/google-chart-elasticsearch/google-chart.html

@@ -102,7 +102,7 @@ Data can be provided in one of three ways:
       },
       data: {
         type: Object,
-        observer: '_dataChanged'              
+        observer: '_dataChanged'
       },
       /**
        * Sets the options for the chart.
@@ -259,7 +259,7 @@ Data can be provided in one of three ways:
         type: Array,
         notify: true,
         value: function() { return []; }
-      }, 
+      },
       isSelected: {
         type: Boolean,
         value: false
@@ -314,7 +314,7 @@ Data can be provided in one of three ways:
           term1[field] = param
         }
 
-        
+
 
         if(sel==null){
           //console.log("inside")
@@ -327,7 +327,7 @@ Data can be provided in one of three ways:
           console.log(value)
           var sources=this.sources
           for(var key in sources){
-            
+
             if(key.search(value)>=0){
               console.log(key)
               param=key
@@ -352,14 +352,14 @@ Data can be provided in one of three ways:
           }*/
           console.log(value)
           for(var key in sources){
-            
+
             if(key.search(value)>=0){
               console.log(key)
               param=key
               break
             }
           }
-          
+
            term1[field] = param;
         }
 
@@ -374,13 +374,13 @@ Data can be provided in one of three ways:
           var term = date[1]+'-'+date[0]+'-01'
           object = {range: {'schema:datePublished': {gte: term, boost: 5}}}
         }
-        
+
         var isInside = -1
         for(var i = 0; i < this.filters.length; i++){
           if(JSON.stringify(this.filters[i].term) === JSON.stringify(term1))
               isInside = i
         }
-        
+
         if(isInside == -1){
           //console.log("Dentro")
           this.push('filters', object)
@@ -535,7 +535,7 @@ Data can be provided in one of three ways:
       if (!data) {
         data = this.data;
         //console.log(data['aggregations']['schema:author']['buckets'][1])
-        
+
       }
       if (!data)
         data = [];
@@ -563,16 +563,28 @@ Data can be provided in one of three ways:
             ['2007',  1030,      540]
           ];
           console.log(data)*/
-          /*this.rows.push(["8-2018", 5, 3, 1]) 
+          /*this.rows.push(["8-2018", 5, 3, 1])
           this.rows.push(["9-2018", 2, 5, 4])
-          this.rows.push(["10-2018", 5, 3, 1]) 
+          this.rows.push(["10-2018", 5, 3, 1])
           this.rows.push(["12-2018", 1, 2, 4])*/
           //console.log(this.rows)
           if (this.rows && this.cols) {
             dataTable = new google.visualization.DataTable(this.rows);
           } else if (this.rows.length > 0) {
-            dataTable = google.visualization.arrayToDataTable(this.rows);
+
+            // There is an error when rows have not the same length, we have to
+            // delete unnecesary data from rows (undefined values)
             
+            var numCols = 0;
+            for(; this.rows[0][numCols] != undefined; numCols++);
+
+            // Make sure that rows have the same length
+            for(var i = 0; i < this.rows.length; i++){
+              this.rows[i].splice(numCols);
+            }
+
+            dataTable = google.visualization.arrayToDataTable(this.rows);
+
           }
         }
       return dataTable;
@@ -604,7 +616,7 @@ Data can be provided in one of three ways:
         //var column_titles=["Date", "cnn", "Al Jazeera", "The New York Times"]
         var sources=this.data.aggregations['schema:author'].buckets
         //console.log(sources)
-        
+
         sources.forEach(function(source){
           //console.log(source)
           if(source.key.search("Twitter")<0 && source.key.search("Rumiyah")<0 && source.key.search("Dabiq")<0)
@@ -641,7 +653,7 @@ Data can be provided in one of three ways:
           }
         }else{
           data=[]
-        }  
+        }
         //console.log(data)
       }
       else if(this.field == "schema:author"){
@@ -674,7 +686,7 @@ Data can be provided in one of three ways:
       }
     }
 
-    
+
   });
 })();
 </script>