diff --git a/src/designer/elsa-workflows-studio/src/plugins/fork-plugin.tsx b/src/designer/elsa-workflows-studio/src/plugins/fork-plugin.tsx
index 218d9a85b..22b51660d 100644
--- a/src/designer/elsa-workflows-studio/src/plugins/fork-plugin.tsx
+++ b/src/designer/elsa-workflows-studio/src/plugins/fork-plugin.tsx
@@ -18,7 +18,7 @@ export class ForkPlugin implements ElsaPlugin {
     const props = activityModel.properties || [];
     const syntax = SyntaxNames.Json;
     const branches = props.find(x => x.name == 'Branches') || {expressions: {'Json': '[]'}, syntax: syntax};
-    const expression = branches.expressions[syntax];
+    const expression = branches.expressions[syntax] || '[]';
     context.outcomes = !!expression['$values'] ? expression['$values'] : parseJson(expression) || [];
   }
 }
diff --git a/src/designer/elsa-workflows-studio/src/plugins/run-javascript-plugin.tsx b/src/designer/elsa-workflows-studio/src/plugins/run-javascript-plugin.tsx
index 875ae6a2c..907226a29 100644
--- a/src/designer/elsa-workflows-studio/src/plugins/run-javascript-plugin.tsx
+++ b/src/designer/elsa-workflows-studio/src/plugins/run-javascript-plugin.tsx
@@ -17,7 +17,7 @@ export class RunJavascriptPlugin implements ElsaPlugin {
 
     const props = activityModel.properties || [];
     const outcomes = props.find(x => x.name == 'PossibleOutcomes') || { expressions: {'Json': ''}, syntax: SyntaxNames.Json };
-    const expression = outcomes.expressions[SyntaxNames.Json];
+    const expression = outcomes.expressions[SyntaxNames.Json] || '[]';
     context.outcomes = parseJson(expression) || ['Done'];
 
     if(context.outcomes.length == 0)
diff --git a/src/designer/elsa-workflows-studio/src/plugins/state-plugin.tsx b/src/designer/elsa-workflows-studio/src/plugins/state-plugin.tsx
index 018d83b56..1505bb47f 100644
--- a/src/designer/elsa-workflows-studio/src/plugins/state-plugin.tsx
+++ b/src/designer/elsa-workflows-studio/src/plugins/state-plugin.tsx
@@ -21,7 +21,7 @@ export class StatePlugin implements ElsaPlugin {
 
     const transitionsSyntax = SyntaxNames.Json;
     const transitions = props.find(x => x.name == 'Transitions') || {expressions: {'Json': '[]'}, syntax: transitionsSyntax};
-    const transitionsExpression = transitions.expressions[transitionsSyntax];
+    const transitionsExpression = transitions.expressions[transitionsSyntax] || '[]';
     context.outcomes = !!transitionsExpression['$values'] ? transitionsExpression['$values'] : parseJson(transitionsExpression) || [];
   }
 }
diff --git a/src/designer/elsa-workflows-studio/src/plugins/switch-plugin.tsx b/src/designer/elsa-workflows-studio/src/plugins/switch-plugin.tsx
index 8760046f3..f317234ce 100644
--- a/src/designer/elsa-workflows-studio/src/plugins/switch-plugin.tsx
+++ b/src/designer/elsa-workflows-studio/src/plugins/switch-plugin.tsx
@@ -19,7 +19,7 @@ export class SwitchPlugin implements ElsaPlugin {
     const props = activityModel.properties || [];
     const syntax = 'Switch';
     const casesProp = props.find(x => x.name == 'Cases') || { expressions: {'Switch': ''}, syntax: syntax };
-    const expression = casesProp.expressions[syntax];
+    const expression = casesProp.expressions[syntax] || '[]';
     const cases: Array<SwitchCase> = !!expression['$values'] ? expression['$values'] : parseJson(expression) || [];
     context.outcomes = [...cases.map(x => x.name), 'Default'];
   }
diff --git a/src/designer/elsa-workflows-studio/src/plugins/user-task-plugin.tsx b/src/designer/elsa-workflows-studio/src/plugins/user-task-plugin.tsx
index a36b6234d..95f6118a7 100644
--- a/src/designer/elsa-workflows-studio/src/plugins/user-task-plugin.tsx
+++ b/src/designer/elsa-workflows-studio/src/plugins/user-task-plugin.tsx
@@ -18,7 +18,7 @@ export class UserTaskPlugin implements ElsaPlugin {
     const props = activityModel.properties || [];
     const syntax = SyntaxNames.Json;
     const branches = props.find(x => x.name == 'Actions') || {expressions: {'Json': '[]'}, syntax: syntax};
-    const expression = branches.expressions[syntax];
+    const expression = branches.expressions[syntax] || '[]';
     context.outcomes = !!expression['$values'] ? expression['$values'] : parseJson(expression) || [];
   }
 }