diff --git a/Cpp2IL.Core/ProcessingLayers/CallAnalysisProcessingLayer.cs b/Cpp2IL.Core/ProcessingLayers/CallAnalysisProcessingLayer.cs
index 9250594a..e83af639 100644
--- a/Cpp2IL.Core/ProcessingLayers/CallAnalysisProcessingLayer.cs
+++ b/Cpp2IL.Core/ProcessingLayers/CallAnalysisProcessingLayer.cs
@@ -96,7 +96,7 @@ private static void InjectAttribute(ApplicationAnalysisContext appContext)
                     {
                         continue;
                     }
-                    if (instruction.Operands.Length > 0 && instruction.Operands[0].Data is IsilImmediateOperand operand)
+                    if (instruction.Operands.Length > 0 && instruction.Operands[0].Data is IsilImmediateOperand operand && operand.Value is not string)
                     {
                         var address = operand.Value.ToUInt64(null);
                         if (appContext.MethodsByAddress.TryGetValue(address, out var list))
diff --git a/Cpp2IL.Core/ProcessingLayers/NativeMethodDetectionProcessingLayer.cs b/Cpp2IL.Core/ProcessingLayers/NativeMethodDetectionProcessingLayer.cs
index 7a846156..d03d40c0 100644
--- a/Cpp2IL.Core/ProcessingLayers/NativeMethodDetectionProcessingLayer.cs
+++ b/Cpp2IL.Core/ProcessingLayers/NativeMethodDetectionProcessingLayer.cs
@@ -86,7 +86,7 @@ private static void AnalyzeMethod(ApplicationAnalysisContext appContext, MethodA
 
     private static bool TryGetAddressFromInstruction(InstructionSetIndependentInstruction instruction, out ulong address)
     {
-        if (instruction.Operands.Length > 0 && instruction.Operands[0].Data is IsilImmediateOperand operand)
+        if (instruction.Operands.Length > 0 && instruction.Operands[0].Data is IsilImmediateOperand operand && operand.Value is not string)
         {
             address = operand.Value.ToUInt64(null);
             return true;