diff --git a/backends/arm/operators/op_sub.py b/backends/arm/operators/op_sub.py
index 1f701f29b1e..ef9ed31c88d 100644
--- a/backends/arm/operators/op_sub.py
+++ b/backends/arm/operators/op_sub.py
@@ -40,9 +40,19 @@ def define_node(
     ) -> None:
         # Specification (0.80) states that input and output types
         # should all be the same
-        assert inputs[0].dtype == inputs[1].dtype == output.dtype
+        if inputs[0].dtype != inputs[1].dtype or inputs[0].dtype != output.dtype:
+            raise TypeError(
+                f"All IO needs to have the same data type, got input 1: "
+                f"{inputs[0].dtype}, input 2: {inputs[1].dtype} and output: "
+                f"{output.dtype}"
+            )
+
         # Handle int8 (quantized) and int32
-        assert inputs[0].dtype in [ts.DType.INT8, ts.DType.INT32]
+        supported_dtypes = [ts.DType.INT8, ts.DType.INT32]
+        if inputs[0].dtype not in supported_dtypes:
+            raise TypeError(
+                f'IO data type needs to be {supported_dtypes}, got "{inputs[0].dtype}"'
+            )
 
         if inputs[0].dtype == ts.DType.INT8:
             rescaled_inputs, scale_back = tqutils.insert_rescale_ops_to_int32(
@@ -97,15 +107,27 @@ def define_node(
     ) -> None:
         # Specification (0.80) states that input and output types
         # should all be the same
-        assert inputs[0].dtype == inputs[1].dtype == output.dtype
+        if inputs[0].dtype != inputs[1].dtype or inputs[0].dtype != output.dtype:
+            raise TypeError(
+                f"All IO needs to have the same data type, got input 1: "
+                f"{inputs[0].dtype}, input 2: {inputs[1].dtype} and output: "
+                f"{output.dtype}"
+            )
 
         if inputs[0].dtype in [ts.DType.INT8, ts.DType.INT32]:
             # Call the inherited define_node for handling integers
             super().define_node(node, tosa_graph, inputs, output)
         else:
             # FP32 Sub lowering
-            assert inputs[0].dtype == ts.DType.FP32
-            assert output.dtype == ts.DType.FP32
+            if (
+                inputs[0].dtype != ts.DType.FP32
+                or inputs[1].dtype != ts.DType.FP32
+                or output.dtype != ts.DType.FP32
+            ):
+                raise TypeError(
+                    f"All IO needs to have data type fp32. Got: {inputs[0].dtype}, "
+                    f"input 2: {inputs[1].dtype} and output: {output.dtype}"
+                )
 
             # MI lowering
             tosa_graph.addOperator(