diff --git a/lib/crewai/src/crewai/tools/tool_usage.py b/lib/crewai/src/crewai/tools/tool_usage.py
index e92ba03eed..c523b2bb43 100644
--- a/lib/crewai/src/crewai/tools/tool_usage.py
+++ b/lib/crewai/src/crewai/tools/tool_usage.py
@@ -850,7 +850,7 @@ def _original_tool_calling(
 
         if not isinstance(arguments, dict):
             if raise_error:
-                raise
+                raise ToolUsageError(f"{I18N_DEFAULT.errors('tool_arguments_error')}")
             return ToolUsageError(f"{I18N_DEFAULT.errors('tool_arguments_error')}")
 
         return ToolCalling(
diff --git a/lib/crewai/tests/tools/test_tool_usage.py b/lib/crewai/tests/tools/test_tool_usage.py
index 9d61c93a9b..75bd54414e 100644
--- a/lib/crewai/tests/tools/test_tool_usage.py
+++ b/lib/crewai/tests/tools/test_tool_usage.py
@@ -25,7 +25,7 @@
 )
 from crewai.tools import BaseTool
 from crewai.tools.tool_calling import ToolCalling
-from crewai.tools.tool_usage import ToolUsage
+from crewai.tools.tool_usage import ToolUsage, ToolUsageError
 from crewai.utilities.tool_utils import execute_tool_and_check_finality
 from pydantic import BaseModel, Field
 import pytest
@@ -346,6 +346,37 @@ def test_validate_tool_input_with_special_characters():
     assert arguments == expected_arguments
 
 
+def test_original_tool_calling_non_dict_arguments_raises_tool_usage_error():
+    """Regression test for #6430.
+
+    The non-dict arguments branch in `_original_tool_calling` used a bare
+    `raise` with no active exception, so hitting it with `raise_error=True`
+    crashed with `RuntimeError: No active exception to re-raise` instead of
+    raising a meaningful `ToolUsageError`.
+    """
+    tool = RandomNumberTool()
+    tool_usage = ToolUsage(
+        tools_handler=MagicMock(),
+        tools=[tool],
+        task=MagicMock(),
+        function_calling_llm=MagicMock(),
+        agent=MagicMock(),
+        action=MagicMock(),
+    )
+
+    with (
+        patch.object(
+            tool_usage, "_validate_tool_input", return_value=["not", "a", "dict"]
+        ),
+        patch.object(tool_usage, "_select_tool", return_value=tool),
+    ):
+        with pytest.raises(ToolUsageError):
+            tool_usage._original_tool_calling("", raise_error=True)
+
+        result = tool_usage._original_tool_calling("")
+        assert isinstance(result, ToolUsageError)
+
+
 def test_validate_tool_input_none_input():
     tool_usage = ToolUsage(
         tools_handler=MagicMock(),