Check if widget is mounted before calling setstate() (#193)

lib/widget/home.dart

@@ -177,7 +177,9 @@ class _InvenTreeHomePageState extends State<InvenTreeHomePage> {
 
         // Attempt server connection
         InvenTreeAPI().connectToServer().then((result) {
-          setState(() {});
+          if (mounted) {
+            setState(() {});
+          }
         });
       }
     }

lib/widget/location_display.dart

@@ -128,7 +128,9 @@ class _LocationDisplayState extends RefreshableState<LocationDisplayWidget> {
       }
     }
 
-    setState(() {});
+    if (mounted) {
+      setState(() {});
+    }
   }
 
   Future<void> _newLocation(BuildContext context) async {

lib/widget/part_detail.dart

@@ -91,9 +91,9 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
   Future<void> onBuild(BuildContext context) async {
     refresh(context);
 
-    setState(() {
-
-    });
+    if (mounted) {
+      setState(() {});
+    }
   }
 
   @override
@@ -123,8 +123,9 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
 
     // Request part test templates
     part.getTestTemplates().then((value) {
-      setState(() {
-      });
+      if (mounted) {
+        setState(() {});
+      }
     });
 
     // Request the number of attachments
@@ -133,9 +134,11 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
         "part": part.pk.toString(),
       }
     ).then((int value) {
-      setState(() {
-        attachmentCount = value;
-      });
+      if (mounted) {
+        setState(() {
+          attachmentCount = value;
+        });
+      }
     });
 
     // Request the number of BOM items
@@ -144,9 +147,11 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
         "in_bom_for": part.pk.toString(),
       }
     ).then((int value) {
-      setState(() {
-        bomCount = value;
-      });
+      if (mounted) {
+        setState(() {
+          bomCount = value;
+        });
+      }
     });
 
     // Request the number of variant items
@@ -155,9 +160,11 @@ class _PartDisplayState extends RefreshableState<PartDetailWidget> {
         "variant_of": part.pk.toString(),
       }
     ).then((int value) {
-      setState(() {
-        variantCount = value;
-      });
+      if (mounted) {
+        setState(() {
+          variantCount = value;
+        });
+      }
     });
   }
 

lib/widget/stock_detail.dart

@@ -124,9 +124,12 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
 
     // Request test results (async)
     item.getTestResults().then((value) {
-      setState(() {
-        // Update
-      });
+
+      if (mounted) {
+        setState(() {
+          // Update
+        });
+      }
     });
 
     // Request the number of attachments
@@ -135,9 +138,12 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
         "stock_item": item.pk.toString()
       }
     ).then((int value) {
-      setState(() {
-        attachmentCount = value;
-      });
+
+      if (mounted) {
+        setState(() {
+          attachmentCount = value;
+        });
+      }
     });
 
     // Request information on labels available for this stock item
@@ -169,8 +175,9 @@ class _StockItemDisplayState extends RefreshableState<StockDetailWidget> {
           }
         }
 
-        setState(() {
-        });
+        if (mounted) {
+          setState(() {});
+        }
       }
     });
   }