Index: tests/Zend/Acl/AclTest.php
===================================================================
--- tests/Zend/Acl/AclTest.php	(revision 18232)
+++ tests/Zend/Acl/AclTest.php	(working copy)
@@ -1197,7 +1197,29 @@
     	}    	
     	return new Zend_Acl_UseCase1_Acl();
     }
-    
+
+    /**
+     * Confirm that deleting a role after allowing access to all roles
+     * raise undefined index error
+     *
+     * @group ZF-5700
+     */
+    public function testRemovingRoleAfterItWasAllowedAccessToAllResourcesGivesError()
+    {
+        $acl = new Zend_Acl();
+        $acl->addRole(new Zend_Acl_Role('test0'));
+        $acl->addRole(new Zend_Acl_Role('test1'));
+        $acl->addRole(new Zend_Acl_Role('test2'));
+        $acl->addResource(new Zend_Acl_Resource('Test'));
+
+        $acl->allow(null,'Test','xxx');
+
+        // error test
+        $acl->removeRole('test0');
+
+        // Check after fix
+        $this->assertFalse($acl->hasRole('test0'));
+    }
 }
 
 
Index: library/Zend/Acl.php
===================================================================
--- library/Zend/Acl.php	(revision 18232)
+++ library/Zend/Acl.php	(working copy)
@@ -218,9 +218,11 @@
             }
         }
         foreach ($this->_rules['byResourceId'] as $resourceIdCurrent => $visitor) {
-            foreach ($visitor['byRoleId'] as $roleIdCurrent => $rules) {
-                if ($roleId === $roleIdCurrent) {
-                    unset($this->_rules['byResourceId'][$resourceIdCurrent]['byRoleId'][$roleIdCurrent]);
+            if (array_key_exists('byRoleId', $visitor)) {
+                foreach ($visitor['byRoleId'] as $roleIdCurrent => $rules) {
+                    if ($roleId === $roleIdCurrent) {
+                        unset($this->_rules['byResourceId'][$resourceIdCurrent]['byRoleId'][$roleIdCurrent]);
+                    }
                 }
             }
         }