diff --git a/src/app/game-model/gamesystems/ProductGamesystem.ts b/src/app/game-model/gamesystems/ProductGamesystem.ts
index 6166b18..01d7d1f 100644
--- a/src/app/game-model/gamesystems/ProductGamesystem.ts
+++ b/src/app/game-model/gamesystems/ProductGamesystem.ts
@@ -7,6 +7,7 @@ import {SimpleState} from "./states/SimpleState";
 import {SimpleGamesystem} from "./SimpleGamesystem";
 import {GameModel} from "../GameModel";
 import {ProductStateTrainer} from "../../../../e2e/game-model/gamesystems/productGamesystems/ProductStateTrainer";
+import {ScriptAccountCondition} from "./conditions/ScriptAccountCondition";
 
 export class ProductGamesystem extends Gamesystem<ProductState, ProductTransition> {
 
@@ -99,20 +100,34 @@ export class ProductGamesystem extends Gamesystem<ProductState, ProductTransitio
         for(let i=0; i<leftState.outgoingTransitions.length; i++) {
           for(let j=0; j<rightState.outgoingTransitions.length; j++) {
             const startingState = productGamesystem.generateBinaryProductState(leftState, rightState, left_temp);
-            const endingState_right = productGamesystem.generateBinaryProductState(leftState, rightState.outgoingTransitions[j].endingState, left_temp);
-            const transition_right = productGamesystem.createTransition(startingState, endingState_right)!;
 
-            const endingState_left = productGamesystem.generateBinaryProductState(leftState.outgoingTransitions[i].endingState, rightState, left_temp);
-            const transition_left = productGamesystem.createTransition(startingState, endingState_left)!;
+            if(startingState != undefined) {
+              const endingState_right = productGamesystem.generateBinaryProductState(leftState, rightState.outgoingTransitions[j].endingState, left_temp);
+              if(endingState_right != undefined) {
+                const transition_right = productGamesystem.createTransition(startingState, endingState_right)!;
+              }
+
+              const endingState_left = productGamesystem.generateBinaryProductState(leftState.outgoingTransitions[i].endingState, rightState, left_temp);
+              if(endingState_left != undefined) {
+                const transition_left = productGamesystem.createTransition(startingState, endingState_left)!;
+              }
+
+
+              const endingState_left_right = productGamesystem.generateBinaryProductState(leftState.outgoingTransitions[i].endingState, rightState.outgoingTransitions[j].endingState, left_temp);
+              if(endingState_left_right != undefined) {
+                const transition_left_right = productGamesystem.createTransition(startingState, endingState_left_right)!;
+              }
+            }
 
-            const endingState_left_right = productGamesystem.generateBinaryProductState(leftState.outgoingTransitions[i].endingState, rightState.outgoingTransitions[j].endingState, left_temp);
-            const transition_left_right = productGamesystem.createTransition(startingState, endingState_left_right)!;
           }
 
           if(rightState.outgoingTransitions.length == 0) {
             const startingState = productGamesystem.generateBinaryProductState(leftState, rightState, left_temp);
             const endingState = productGamesystem.generateBinaryProductState(leftState.outgoingTransitions[i].endingState, rightState, left_temp);
-            const transition = productGamesystem.createTransition(startingState, endingState);
+
+            if(startingState != undefined && endingState != undefined) {
+              const transition = productGamesystem.createTransition(startingState, endingState);
+            }
           }
         }
 
@@ -120,11 +135,17 @@ export class ProductGamesystem extends Gamesystem<ProductState, ProductTransitio
           for(let j=0; j<rightState.outgoingTransitions.length; j++) {
             const startingState = productGamesystem.generateBinaryProductState(leftState, rightState, left_temp);
             const endingState = productGamesystem.generateBinaryProductState(leftState, rightState.outgoingTransitions[j].endingState, left_temp);
-            const transition = productGamesystem.createTransition(startingState, endingState);
+
+            if(startingState != undefined && endingState != undefined) {
+              const transition = productGamesystem.createTransition(startingState, endingState);
+            }
+
           }
         }
       })
     })
+
+
     return productGamesystem;
   }
 
@@ -146,6 +167,17 @@ export class ProductGamesystem extends Gamesystem<ProductState, ProductTransitio
 
     let productInitial = true;
     binary_productState.innerStates.forEach(innerState => productInitial = productInitial && innerState.initial)
+    binary_productState!.initial = productInitial
+
+    const combinedStateConditions: ScriptAccountCondition[] = leftInnerState.conditions.concat(rightInnerState.conditions)
+    const conditionsContradicting = false
+    for(let i=0; i<combinedStateConditions.length; i++) {
+      for(let j=0; j<combinedStateConditions.length; j++) {
+        if(combinedStateConditions[i].isContradicting(combinedStateConditions[j])) {
+          return undefined
+        }
+      }
+    }
     return binary_productState!;
   }
 
diff --git a/testModel/gamesystems/Weathersystem/Season.json b/testModel/gamesystems/Weathersystem/Season.json
new file mode 100644
index 0000000..a815ccb
--- /dev/null
+++ b/testModel/gamesystems/Weathersystem/Season.json
@@ -0,0 +1,80 @@
+{
+    "componentName": "Season",
+    "componentDescription": "Ein simples Gamesystem zur Modellierung verschiedener Jahreszeiten und deren Übergänge",
+    "states": [
+        {
+            "initial": true,
+            "conditions": [
+                {
+                    "scriptAccount": "Temperature",
+                    "minValue": 0,
+                    "maxValue": "10"
+                }
+            ],
+            "stateLabel": "Frühling",
+            "stateDescription": ""
+        },
+        {
+            "initial": false,
+            "conditions": [
+                {
+                    "scriptAccount": "Temperature",
+                    "minValue": "10",
+                    "maxValue": "30"
+                }
+            ],
+            "stateLabel": "Sommer",
+            "stateDescription": ""
+        },
+        {
+            "initial": false,
+            "conditions": [
+                {
+                    "scriptAccount": "Temperature",
+                    "minValue": "10",
+                    "maxValue": "20"
+                }
+            ],
+            "stateLabel": "Herbst",
+            "stateDescription": ""
+        },
+        {
+            "initial": false,
+            "conditions": [
+                {
+                    "scriptAccount": "Temperature",
+                    "minValue": "-10",
+                    "maxValue": "10"
+                }
+            ],
+            "stateLabel": "Winter",
+            "stateDescription": ""
+        }
+    ],
+    "transitions": [
+        {
+            "scriptAccountActions": [],
+            "scriptAccountConditions": [],
+            "startingState": "Frühling",
+            "endingState": "Sommer"
+        },
+        {
+            "scriptAccountActions": [],
+            "scriptAccountConditions": [],
+            "startingState": "Sommer",
+            "endingState": "Herbst"
+        },
+        {
+            "scriptAccountActions": [],
+            "scriptAccountConditions": [],
+            "startingState": "Herbst",
+            "endingState": "Winter"
+        },
+        {
+            "scriptAccountActions": [],
+            "scriptAccountConditions": [],
+            "startingState": "Winter",
+            "endingState": "Frühling"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/testModel/gamesystems/Weathersystem/Weather.json b/testModel/gamesystems/Weathersystem/Weather.json
index f35425f..b9de825 100644
--- a/testModel/gamesystems/Weathersystem/Weather.json
+++ b/testModel/gamesystems/Weathersystem/Weather.json
@@ -3,7 +3,7 @@
     "componentDescription": "A small Gamesystem about local weather events",
     "states": [
         {
-            "initial": false,
+            "initial": true,
             "conditions": [],
             "stateLabel": "Sonne",
             "stateDescription": ""