diff --git a/src/Visualizer/keywords/keywords.py b/src/Visualizer/keywords/keywords.py
index 843d9f0..e915c0e 100644
--- a/src/Visualizer/keywords/keywords.py
+++ b/src/Visualizer/keywords/keywords.py
@@ -235,3 +235,7 @@ def visualize(
         plt.tight_layout(rect=[0, 0, 1, 0.95])
         # Save plot to PNG file
         plt.savefig(full_file_path, format='png')
+
+        # Reset internal data cache for each diagram
+        self.graph_data.clear()
+        self.diagram_name = None
diff --git a/tests/atest/generic.robot b/tests/atest/generic.robot
index d078fed..65c5c8c 100644
--- a/tests/atest/generic.robot
+++ b/tests/atest/generic.robot
@@ -32,5 +32,18 @@ Reset Data Object
     BuiltIn.Run Keyword And Expect Error    REGEXP: ValueError.*
     ...    Visualizer.Visualize    Strom / Spannung Verlauf
 
-
-    
+Multiple Diagrams in One Test Case
+    GROUP    Diagram 01
+        Visualizer.Add To Diagramm    ${CURDIR}${/}testdata${/}dummy_strom_spannung.csv    _time    _spannung    Spannung    Green
+        Visualizer.Add To Diagramm    ${CURDIR}${/}testdata${/}dummy_strom_spannung.csv    _time    _strom    Strom    Blue
+        Visualizer.Visualize    Diagram 1
+    END
+    GROUP    Diagram 02
+        Visualizer.Add To Diagramm    ${CURDIR}${/}testdata${/}dummy_strom_spannung.csv    _time    _spannung    Spannung    Green
+        Visualizer.Visualize    Diagram 2
+    END
+    GROUP    Diagram 03
+        Visualizer.Add To Diagramm    ${CURDIR}${/}testdata${/}dummy_strom_spannung.csv    _time    _spannung    Spannung    Green
+        Visualizer.Add To Diagramm    ${CURDIR}${/}testdata${/}dummy_strom_spannung.csv    _time    _strom    Strom    Blue
+        Visualizer.Visualize    Diagram 3
+    END