Add if (node.name === FunctionDefinition)

src/app/editor/contextView.js

@@ -172,6 +172,7 @@ class ContextView {
     </div>`
 
     function showGasEstimation () {
+      if (node.name === 'FunctionDefinition') {
         var result = self._api.contextualListener.gasEstimation(node)
         var executionCost = 'Execution cost: ' + result.executionCost + ' gas'
         var codeDepositCost = 'Code deposit cost: ' + result.codeDepositCost + ' gas'
@@ -181,7 +182,7 @@ class ContextView {
         ${estimatedGas}
         </div>`
       }
-
+    }
   }
 }