diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index d966edf5..c607faf6 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -2921,6 +2921,12 @@ class CompilerBase extends \PhpAot\Core\Translator
                     $cePtr = 'php_get_called_ce(this_)';
                 } else {
                     $className = $this->getNamespacedClassName($className);
+                    if ($this->hasNativeClass($className)) {
+                        $classDef = $this->getClassDef($className);
+                        if ($classDef->flags & Modifiers::ABSTRACT) {
+                            $this->fatalError($expr, "abstract class `$className` cannot be instantiated");
+                        }
+                    }
                     $cePtr = $this->getClassEntryPtr($className);
                 }
             } else {
diff --git a/src/Php/Preprocessor.php b/src/Php/Preprocessor.php
index 6beffb06..f3d8ada9 100644
--- a/src/Php/Preprocessor.php
+++ b/src/Php/Preprocessor.php
@@ -225,7 +225,7 @@ class Preprocessor extends CompilerBase
                 case 'Stmt_EnumCase':
                     break;
                 case 'Stmt_ClassMethod':
-                    $this->prepareMethod($v);
+                    $this->prepareMethod($v, $class);
                     break;
                 case 'Stmt_Expression':
                     $this->foundStrayCode($v);
@@ -240,11 +240,15 @@ class Preprocessor extends CompilerBase
         return $code;
     }
 
-    protected function prepareMethod(Node\Stmt\ClassMethod $v): void
+    protected function prepareMethod(Node\Stmt\ClassMethod $v, Node\Stmt\Class_|Node\Stmt\Trait_|Node\Stmt\Enum_ $class): void
     {
         $abstract = $v->flags & Modifiers::ABSTRACT;
         if (!$abstract) {
             $this->prepareFunction($v) . PHP_EOL;
+        } else {
+            if (!($class->flags & Modifiers::ABSTRACT)) {
+                $this->fatalError($v, "Class {$this->class} cannot override non-abstract method {$v->name}");
+            }
         }
 
         $fullClassName = $this->getFullClassName();
diff --git a/tests/core/classes/abstract.phpt b/tests/core/classes/abstract.phpt
index 14af18f9..fec3f4b3 100644
--- a/tests/core/classes/abstract.phpt
+++ b/tests/core/classes/abstract.phpt
@@ -27,9 +27,8 @@ function main() {
 --EXPECTF--
 Call to function show()
 
-Fatal error: Uncaught Error: Cannot call abstract method fail::show() in %s:%d
+Fatal error: Uncaught Error: Cannot call abstract method fail::show() in %s
 Stack trace:
-#0 [internal function]: pass->error()
-#1 Unknown(0) : %s
-#2 {main}
-  thrown in %s on line %d
+#0 Unknown(0) : %s
+#1 {main}
+  thrown in Unknown(0) : %s