diff --git a/src/Php/CompilerBase.php b/src/Php/CompilerBase.php
index 6a34b1c6..db71194b 100644
--- a/src/Php/CompilerBase.php
+++ b/src/Php/CompilerBase.php
@@ -599,8 +599,9 @@ class CompilerBase extends \PhpAot\Core\Translator
     protected function resetNamespace(): void
     {
         $this->useNamespaces = [];
-        $this->useFunctions  = [];
-        $this->namespace     = '';
+        $this->useAliases = [];
+        $this->useFunctions = [];
+        $this->namespace = '';
     }
 
     protected function getFunctionName(FunctionLike $v): string
@@ -654,7 +655,7 @@ class CompilerBase extends \PhpAot\Core\Translator
 
         foreach ($this->useNamespaces as $useNamespace) {
             $ns1 = explode('\\', trim($useNamespace, '\\'));
-            if ($ns1[array_key_last($ns1)] === $ns2[0]) {
+            if (strcasecmp($ns1[array_key_last($ns1)], $ns2[0]) === 0) {
                 $ns = '\\' . implode('\\', $ns1);
                 goto _return;
             }
diff --git a/src/Php/Preprocessor.php b/src/Php/Preprocessor.php
index d3dfd0cd..6beffb06 100644
--- a/src/Php/Preprocessor.php
+++ b/src/Php/Preprocessor.php
@@ -85,6 +85,10 @@ class Preprocessor extends CompilerBase
 
         $phpCode = $this->loadFile($file);
         $this->symbolCallInFile[$this->file] = [];
+        $this->resetFile();
+        $this->resetFunction();
+        $this->resetClass();
+        $this->resetNamespace();
 
         $this->climate->info('prepare: ' . $this->file);
         try {
@@ -194,7 +198,7 @@ class Preprocessor extends CompilerBase
     protected function prepareClass(Node\Stmt\Class_|Node\Stmt\Trait_|Node\Stmt\Enum_ $class): string
     {
         $this->class = $this->parseIdentifier($class->name);
-        $fullClassName = $this->getNamespacedClassName($this->class);
+        $fullClassName = $this->getFullClassName();
         $fullClassNameLower = strtolower($fullClassName);
 
         if (!empty($class->extends)) {
diff --git a/src/Php/Translator.php b/src/Php/Translator.php
index 62ba54ab..ac41a099 100644
--- a/src/Php/Translator.php
+++ b/src/Php/Translator.php
@@ -475,7 +475,7 @@ class Translator extends Preprocessor
     public function getArgInfoHeaderFile(string $stubFilenameWithoutExtension, bool $relative = false): string
     {
         foreach ($this->sourceDirs as $srcDir) {
-            if (str_starts_with($stubFilenameWithoutExtension, $srcDir)) {
+            if (!is_dir($srcDir) or str_starts_with($stubFilenameWithoutExtension, $srcDir)) {
                 $filePath = ltrim($this->removeCommonPrefix($srcDir, $stubFilenameWithoutExtension), '/');
                 break;
             }