Fixes #3183: fixed regression after #3175

framework/views/errorHandler/error.php

@@ -8,9 +8,8 @@ if ($exception instanceof \yii\web\HttpException) {
 } else {
     $code = $exception->getCode();
 }
-if ($exception instanceof \yii\base\Exception) {
-    $name = $exception->getName();
-} else {
+$name = $handler->getExceptionName($exception);
+if ($name === null) {
     $name = 'Error';
 }
 if ($code) {

framework/views/errorHandler/exception.php

@@ -12,13 +12,17 @@
     <meta charset="utf-8"/>
 
     <title><?php
+        $name = $handler->getExceptionName($exception);
         if ($exception instanceof \yii\web\HttpException) {
-            echo (int) $exception->statusCode . ' ' . $handler->htmlEncode($exception->getName());
-        } elseif ($exception instanceof \yii\base\Exception) {
-            echo $handler->htmlEncode($exception->getName() . ' – ' . get_class($exception));
+            echo (int) $exception->statusCode . ' ' . $handler->htmlEncode($name);
+        } else {
+            $name = $handler->getExceptionName($exception);
+            if ($name !== null) {
+                echo $handler->htmlEncode($name . ' – ' . get_class($exception));
             } else {
                 echo $handler->htmlEncode(get_class($exception));
             }
+        }
     ?></title>
 
     <style type="text/css">
@@ -331,12 +335,15 @@ html,body{
                 if ($exception instanceof \yii\web\HttpException) {
                     echo '<span>' . $handler->createHttpStatusLink($exception->statusCode, $handler->htmlEncode($exception->getName())) . '</span>';
                     echo ' &ndash; ' . $handler->addTypeLinks(get_class($exception));
-                } elseif ($exception instanceof \yii\base\Exception) {
-                    echo '<span>' . $handler->htmlEncode($exception->getName()) . '</span>';
+                } else {
+                    $name = $handler->getExceptionName($exception);
+                    if ($name !== null) {
+                        echo '<span>' . $handler->htmlEncode($name) . '</span>';
                         echo ' &ndash; ' . $handler->addTypeLinks(get_class($exception));
                     } else {
                         echo '<span>' . $handler->htmlEncode(get_class($exception)) . '</span>';
                     }
+                }
             ?></h1>
         <?php endif; ?>
         <h2><?= nl2br($handler->htmlEncode($exception->getMessage())) ?></h2>

framework/views/errorHandler/previousException.php

@@ -8,8 +8,9 @@
     <span class="arrow">&crarr;</span>
     <h2>
         <span>Caused by:</span>
-        <?php if ($exception instanceof \yii\base\Exception): ?>
-            <span><?= $handler->htmlEncode($exception->getName()) ?></span> &ndash;
+        <?php $name = $handler->getExceptionName($exception);
+            if ($name !== null): ?>
+            <span><?= $handler->htmlEncode($name) ?></span> &ndash;
             <?= $handler->addTypeLinks(get_class($exception)) ?>
         <?php else: ?>
             <span><?= $handler->htmlEncode(get_class($exception)) ?></span>

framework/web/ErrorHandler.php

@@ -379,4 +379,17 @@ class ErrorHandler extends \yii\base\ErrorHandler
 
         return $out;
     }
+
+    /**
+     * Returns human-readable exception name
+     * @param \Exception $exception
+     * @return string human-readable exception name or null if it cannot be determined
+     */
+    public function getExceptionName($exception)
+    {
+        if ($exception instanceof \yii\base\Exception || $exception instanceof \yii\base\InvalidCallException || $exception instanceof \yii\base\InvalidParamException || $exception instanceof \yii\base\UnknownMethodException) {
+            return $exception->getName();
+        }
+        return null;
+    }
 }