diff --git a/libyul/AsmAnalysis.cpp b/libyul/AsmAnalysis.cpp
index 3cbed9c77..1be1cf1a0 100644
--- a/libyul/AsmAnalysis.cpp
+++ b/libyul/AsmAnalysis.cpp
@@ -629,7 +629,9 @@ void AsmAnalyzer::warnOnInstructions(solidity::Instruction _instr, SourceLocatio
 
 	if (_instr == solidity::Instruction::JUMP || _instr == solidity::Instruction::JUMPI || _instr == solidity::Instruction::JUMPDEST)
 	{
-		solAssert(m_dialect.flavour == AsmFlavour::Loose, "");
+		if (m_dialect.flavour != AsmFlavour::Loose)
+			solAssert(m_errorTypeForLoose && *m_errorTypeForLoose != Error::Type::Warning, "");
+
 		m_errorReporter.error(
 			m_errorTypeForLoose ? *m_errorTypeForLoose : Error::Type::Warning,
 			_location,
diff --git a/test/tools/yulopti.cpp b/test/tools/yulopti.cpp
index e867f0496..d0643d737 100644
--- a/test/tools/yulopti.cpp
+++ b/test/tools/yulopti.cpp
@@ -94,7 +94,7 @@ public:
 			*m_analysisInfo,
 			errorReporter,
 			EVMVersion::byzantium(),
-			boost::none,
+			langutil::Error::Type::SyntaxError,
 			Dialect::strictAssemblyForEVM()
 		);
 		if (!analyzer.analyze(*m_ast) || !errorReporter.errors().empty())