Merge branch 'master' of https://github.com/ethereum/remix-project into fastcircle

apps/remix-ide/src/app/panels/tab-proxy.js

@@ -229,19 +229,21 @@ export class TabProxy extends Plugin {
           })
           formatPath.shift()
           if (formatPath.length > 0) {
-            const duplicateTabName = this.loadedTabs.find(({ title }) => title === formatPath.join('/')).name
+            const index = this.loadedTabs.findIndex(({ title }) => title === formatPath.join('/'))
+            if (index > -1) {
+              const duplicateTabName = this.loadedTabs[index].name
               const duplicateTabPath = duplicateTabName.split('/')
               const duplicateTabFormatPath = [...duplicateTabPath].reverse()
               const duplicateTabTitle = duplicateTabFormatPath.slice(0, titleLength).reverse().join('/')
-
+              this.loadedTabs[index] = {
-            this.loadedTabs.push({
                 id: duplicateTabName,
                 name: duplicateTabName,
                 title: duplicateTabTitle,
                 icon,
                 tooltip: duplicateTabName,
                 iconClass: helper.getPathIcon(duplicateTabName)
-            })
+              }
+            }
           }
           break
         }