diff --git a/src/utils/saveload.ts b/src/utils/saveload.ts
index ad9a4f3..43a6ec0 100644
--- a/src/utils/saveload.ts
+++ b/src/utils/saveload.ts
@@ -2,6 +2,7 @@
 import { IEditorState } from '../Interfaces/IEditorState';
 import { IHistoryState } from '../Interfaces/IHistoryState';
 import { IContainerModel } from '../Interfaces/IContainerModel';
+import { ISymbolModel } from '../Interfaces/ISymbolModel';
 
 /**
  * Revive the Editor state
@@ -29,13 +30,14 @@ export function ReviveState(state: IHistoryState): void {
     return;
   }
 
-  state.symbols = new Map(state.symbols);
+  const symbols: Array<{ Key: string, Value: ISymbolModel }> = (state.symbols) as any;
+  state.symbols = new Map(symbols.map(({ Key, Value }) => [Key, Value]));
   for (const symbol of state.symbols.values()) {
     symbol.linkedContainers = new Set(symbol.linkedContainers);
   }
 
   const containers: Array<{ Key: string, Value: IContainerModel }> = (state.containers) as any;
-  state.containers = new Map(containers.map(({ Key, Value }: {Key: string, Value: IContainerModel}) => [Key, Value]));
+  state.containers = new Map(containers.map(({ Key, Value }) => [Key, Value]));
 }
 
 export function GetCircularReplacer(): (key: any, value: object | Map<string, any> | null) => object | null | undefined {