diff --git a/src/Files/File.php b/src/Files/File.php
index 1a63437ea4..42e1a39f9b 100644
--- a/src/Files/File.php
+++ b/src/Files/File.php
@@ -1876,6 +1876,10 @@ public function getMemberProperties($stackPtr)
             throw new RuntimeException('$stackPtr must be of type T_VARIABLE');
         }
 
+        if (empty($this->tokens[$stackPtr]['conditions']) === true) {
+            throw new RuntimeException('$stackPtr is not a class member var');
+        }
+
         $conditions = array_keys($this->tokens[$stackPtr]['conditions']);
         $ptr        = array_pop($conditions);
         if (isset($this->tokens[$ptr]) === false
diff --git a/src/Tokenizers/PHP.php b/src/Tokenizers/PHP.php
index dea4438575..b5a7f84ada 100644
--- a/src/Tokenizers/PHP.php
+++ b/src/Tokenizers/PHP.php
@@ -1468,16 +1468,18 @@ protected function tokenize($string)
                 $newToken['type']    = 'T_ATTRIBUTE';
                 $newToken['content'] = '#[';
                 $finalTokens[$newStackPtr] = $newToken;
+                $newStackPtr++;
 
-                $tokens[$bracketCloser]    = [];
-                $tokens[$bracketCloser][0] = T_ATTRIBUTE_END;
-                $tokens[$bracketCloser][1] = ']';
+                if ($bracketCloser !== null) {
+                    $tokens[$bracketCloser]    = [];
+                    $tokens[$bracketCloser][0] = T_ATTRIBUTE_END;
+                    $tokens[$bracketCloser][1] = ']';
 
-                if (PHP_CODESNIFFER_VERBOSITY > 1) {
-                    echo "\t\t* token $bracketCloser changed from T_CLOSE_SQUARE_BRACKET to T_ATTRIBUTE_END".PHP_EOL;
+                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
+                        echo "\t\t* token $bracketCloser changed from T_CLOSE_SQUARE_BRACKET to T_ATTRIBUTE_END".PHP_EOL;
+                    }
                 }
 
-                $newStackPtr++;
                 continue;
             }//end if
 
@@ -2266,7 +2268,7 @@ protected function tokenize($string)
                     }
 
                     if ($prevNonEmpty === null
-                        && isset(Tokens::$emptyTokens[$tokenType]) === false
+                        && @isset(Tokens::$emptyTokens[$tokenType]) === false
                     ) {
                         // Found the previous non-empty token.
                         if ($tokenType === ':' || $tokenType === ',' || $tokenType === T_ATTRIBUTE_END) {
@@ -2285,8 +2287,8 @@ protected function tokenize($string)
 
                     if ($tokenType === T_FUNCTION
                         || $tokenType === T_FN
-                        || isset(Tokens::$methodPrefixes[$tokenType]) === true
-                        || isset(Tokens::$scopeModifiers[$tokenType]) === true
+                        || @isset(Tokens::$methodPrefixes[$tokenType]) === true
+                        || @isset(Tokens::$scopeModifiers[$tokenType]) === true
                         || $tokenType === T_VAR
                         || $tokenType === T_READONLY
                     ) {
@@ -2309,7 +2311,7 @@ protected function tokenize($string)
                         break;
                     }
 
-                    if (isset(Tokens::$emptyTokens[$tokenType]) === false) {
+                    if (@isset(Tokens::$emptyTokens[$tokenType]) === false) {
                         $lastSeenNonEmpty = $tokenType;
                     }
                 }//end for