diff --git a/ets2panda/checker/ets/utilityTypeHandlers.cpp b/ets2panda/checker/ets/utilityTypeHandlers.cpp
index 1041ab4faf7387d6e0cc0f3568786254393c0d47..d004320264a10a805256d42744ccbe68fd37f787 100644
--- a/ets2panda/checker/ets/utilityTypeHandlers.cpp
+++ b/ets2panda/checker/ets/utilityTypeHandlers.cpp
@@ -530,6 +530,7 @@ static void SetupFunctionParams(ir::ScriptFunction *function, varbinder::Functio
                                                  checker->AllocNode<ir::ETSUndefinedType>(checker->Allocator())},
                                                 checker->Allocator()->Adapter()),
                     checker->Allocator());
+            ES2PANDA_ASSERT(unionType != nullptr);
             paramExpr->Ident()->SetTsTypeAnnotation(unionType);
             unionType->SetParent(paramExpr->Ident());
         }
diff --git a/ets2panda/compiler/lowering/ets/genericBridgesLowering.cpp b/ets2panda/compiler/lowering/ets/genericBridgesLowering.cpp
index 08056414191c1854a285f4b64436d36497699d97..fed45f5633c6cd72e2f71629cf9c9c4054bc976f 100644
--- a/ets2panda/compiler/lowering/ets/genericBridgesLowering.cpp
+++ b/ets2panda/compiler/lowering/ets/genericBridgesLowering.cpp
@@ -83,10 +83,10 @@ void GenericBridgesPhase::AddGenericBridge(ir::ClassDefinition const *const clas
     typeNodes.reserve(2U * baseSignature->Params().size() + 2U);
 
     auto const sourceCode = CreateMethodDefinitionString(classDefinition, baseSignature, derivedFunction, typeNodes);
-
-    auto *const bridgeMethod =
-        parser->CreateFormattedClassMethodDefinition(sourceCode, typeNodes)->AsMethodDefinition();
-    ES2PANDA_ASSERT(bridgeMethod);
+    auto *const bridgeMethodDefinition = parser->CreateFormattedClassMethodDefinition(sourceCode, typeNodes);
+    ES2PANDA_ASSERT(bridgeMethodDefinition != nullptr);
+    auto *const bridgeMethod = bridgeMethodDefinition->AsMethodDefinition();
+    ES2PANDA_ASSERT(bridgeMethod != nullptr && methodDefinition->Id() != nullptr);
     bridgeMethod->AddModifier(methodDefinition->Modifiers());
     bridgeMethod->ClearModifier(ir::ModifierFlags::NATIVE | ir::ModifierFlags::ABSTRACT);
     bridgeMethod->AddAstNodeFlags(methodDefinition->GetAstNodeFlags());
diff --git a/ets2panda/ir/ets/etsTypeReference.cpp b/ets2panda/ir/ets/etsTypeReference.cpp
index 21db7e18148714de68f28570854a57ebbaef4fcc..f33748988ebd6eb6f24f32dd462cb1038fb15421 100644
--- a/ets2panda/ir/ets/etsTypeReference.cpp
+++ b/ets2panda/ir/ets/etsTypeReference.cpp
@@ -112,7 +112,12 @@ checker::Type *ETSTypeReference::GetType(checker::ETSChecker *checker)
 
 ETSTypeReference *ETSTypeReference::Clone(ArenaAllocator *const allocator, AstNode *const parent)
 {
-    auto *const partClone = part_ != nullptr ? part_->Clone(allocator, nullptr)->AsETSTypeReferencePart() : nullptr;
+    ETSTypeReferencePart *partClone = nullptr;
+    if (part_ != nullptr) {
+        auto *const clone = part_->Clone(allocator, nullptr);
+        ES2PANDA_ASSERT(clone != nullptr);
+        partClone = clone->AsETSTypeReferencePart();
+    }
     auto *const clone = allocator->New<ETSTypeReference>(partClone, allocator);
 
     if (partClone != nullptr) {