Fix

Author: VincentLanglet

src/Analyser/NodeScopeResolver.php

@@ -174,6 +174,7 @@
 use PHPStan\Type\Constant\ConstantIntegerType;
 use PHPStan\Type\Constant\ConstantStringType;
 use PHPStan\Type\ConstantTypeHelper;
+use PHPStan\Type\ErrorType;
 use PHPStan\Type\FileTypeMapper;
 use PHPStan\Type\GeneralizePrecision;
 use PHPStan\Type\Generic\TemplateTypeHelper;
@@ -199,6 +200,7 @@
 use PHPStan\Type\TypeTraverser;
 use PHPStan\Type\TypeUtils;
 use PHPStan\Type\UnionType;
+use PHPStan\Type\VerbosityLevel;
 use ReflectionFunction;
 use ReflectionMethod;
 use ReflectionProperty;
@@ -6415,7 +6417,11 @@ private function processAssignVar(
 			}
 
 			$setVarType = $scope->getType($originalVar->var);
-			if (!$setVarType->isArray()->yes() && !(new ObjectType(ArrayAccess::class))->isSuperTypeOf($setVarType)->no()) {
+			if (
+				!$setVarType instanceof ErrorType
+				&& !$setVarType->isArray()->yes()
+				&& !(new ObjectType(ArrayAccess::class))->isSuperTypeOf($setVarType)->no()
+			) {
 				$throwPoints = array_merge($throwPoints, $this->processExprNode(
 					$stmt,
 					new MethodCall($originalVar->var, 'offsetSet'),