diff --git a/IDEHelper/Compiler/BfModule.cpp b/IDEHelper/Compiler/BfModule.cpp
index c7ecb2d7..1bfc5099 100644
--- a/IDEHelper/Compiler/BfModule.cpp
+++ b/IDEHelper/Compiler/BfModule.cpp
@@ -23221,7 +23221,7 @@ void BfModule::DoMethodDeclaration(BfMethodDeclaration* methodDeclaration, bool
 			bool interfaceFound = false;
 			for (auto ifaceInst : typeInstance->mInterfaces)
 				interfaceFound |= ifaceInst.mInterfaceType == mCurMethodInstance->mMethodInfoEx->mExplicitInterface;
-			if (!interfaceFound)
+			if ((!interfaceFound) && (!typeInstance->mTypeFailed))
 			{				
 				if (methodDef->mMethodDeclaration != NULL)
 					Fail("Containing class has not declared to implement this interface", methodDef->mMethodDeclaration);
diff --git a/IDEHelper/Compiler/BfModuleTypeUtils.cpp b/IDEHelper/Compiler/BfModuleTypeUtils.cpp
index a2c10aca..6c21ca16 100644
--- a/IDEHelper/Compiler/BfModuleTypeUtils.cpp
+++ b/IDEHelper/Compiler/BfModuleTypeUtils.cpp
@@ -4957,7 +4957,7 @@ void BfModule::DoPopulateType(BfType* resolvedTypeRef, BfPopulateType populateTy
 						bool interfaceFound = false;
 						for (auto ifaceInst : typeInstance->mInterfaces)
 							interfaceFound |= ifaceInst.mInterfaceType == explicitInterface;
-						if (!interfaceFound)
+						if ((!interfaceFound) && (!typeInstance->mTypeFailed))
 						{
 							Fail("Containing class has not declared to implement this interface", propDecl->mExplicitInterface, true);
 						}