diff --git a/phpBB/docs/CHANGELOG.html b/phpBB/docs/CHANGELOG.html
index 97d9968f7c..9894de351a 100644
--- a/phpBB/docs/CHANGELOG.html
+++ b/phpBB/docs/CHANGELOG.html
@@ -139,6 +139,7 @@
 		<li>[Fix] Mark/unmark all links in UCP now select/unselect both subscribed topics and forums.</li>
 		<li>[Fix] Increase board topic counter when splitting topics. (Bug #32125)</li>
 		<li>[Fix] Display profile icons when viewing a topic, or PM when only the jabber icon is to be visible. (Bug #34755)</li>
+		<li>[Fix] Do not send PMs with warnings if the user cannot read PMs or they are disabled. (Bug #30815)</li>
 
 		<li>[Change] No longer allow the direct use of MULTI_INSERT in sql_build_array. sql_multi_insert() must be used.</li>
 		<li>[Change] Display warning in ACP if config.php file is left writable.</li>
diff --git a/phpBB/includes/mcp/mcp_warn.php b/phpBB/includes/mcp/mcp_warn.php
index 7c17de9f43..bf0e66dc67 100644
--- a/phpBB/includes/mcp/mcp_warn.php
+++ b/phpBB/includes/mcp/mcp_warn.php
@@ -249,6 +249,25 @@ class mcp_warn
 			$this->u_action .= "&amp;f=$forum_id&amp;p=$post_id";
 		}
 
+		// Check if can send a notification
+		if ($config['allow_privmsg'])
+		{
+			$auth2 = new auth();
+			$auth2->acl($user_row);
+			$s_can_notify = ($auth2->acl_get('u_readpm')) ? true : false;
+			unset($auth2);
+		}
+		else
+		{
+			$s_can_notify = false;
+		}
+
+		// Prevent against clever people
+		if ($notify && !$s_can_notify)
+		{
+			$notify = false;
+		}
+
 		if ($warning && $action == 'add_warning')
 		{
 			if (check_form_key('mcp_warn'))
@@ -307,6 +326,8 @@ class mcp_warn
 			'RANK_IMG'			=> $rank_img,
 
 			'L_WARNING_POST_DEFAULT'	=> sprintf($user->lang['WARNING_POST_DEFAULT'], generate_board_url() . "/viewtopic.$phpEx?f=$forum_id&amp;p=$post_id#p$post_id"),
+
+			'S_CAN_NOTIFY'		=> $s_can_notify,
 		));
 	}
 
@@ -351,6 +372,25 @@ class mcp_warn
 			$this->u_action .= "&amp;u=$user_id";
 		}
 
+		// Check if can send a notification
+		if ($config['allow_privmsg'])
+		{
+			$auth2 = new auth();
+			$auth2->acl($user_row);
+			$s_can_notify = ($auth2->acl_get('u_readpm')) ? true : false;
+			unset($auth2);
+		}
+		else
+		{
+			$s_can_notify = false;
+		}
+
+		// Prevent against clever people
+		if ($notify && !$s_can_notify)
+		{
+			$notify = false;
+		}
+
 		if ($warning && $action == 'add_warning')
 		{
 			if (check_form_key('mcp_warn'))
@@ -389,6 +429,8 @@ class mcp_warn
 
 			'AVATAR_IMG'		=> $avatar_img,
 			'RANK_IMG'			=> $rank_img,
+
+			'S_CAN_NOTIFY'		=> $s_can_notify,
 		));
 
 		return $user_id;
diff --git a/phpBB/styles/prosilver/template/mcp_warn_post.html b/phpBB/styles/prosilver/template/mcp_warn_post.html
index 5937598a52..d09209f5a4 100644
--- a/phpBB/styles/prosilver/template/mcp_warn_post.html
+++ b/phpBB/styles/prosilver/template/mcp_warn_post.html
@@ -52,11 +52,13 @@
 
 	<fieldset>
 		<textarea name="warning" id="warning" class="inputbox" cols="40" rows="3">{L_WARNING_POST_DEFAULT}</textarea>
+		<!-- IF S_CAN_NOTIFY -->
 		<br /><br />
 		<dl class="panel">
 			<dt>&nbsp;</dt>
 			<dd><label><input type="checkbox" name="notify_user" checked="checked" /> {L_NOTIFY_USER_WARN}</label></dd>
 		</dl>
+		<!-- ENDIF -->
 	</fieldset>
 
 	<span class="corners-bottom"><span></span></span></div>
diff --git a/phpBB/styles/prosilver/template/mcp_warn_user.html b/phpBB/styles/prosilver/template/mcp_warn_user.html
index c807a6b640..5b5156f3a1 100644
--- a/phpBB/styles/prosilver/template/mcp_warn_user.html
+++ b/phpBB/styles/prosilver/template/mcp_warn_user.html
@@ -36,11 +36,13 @@
 
 	<fieldset>
 		<textarea name="warning" id="warning" class="inputbox" cols="40" rows="3"></textarea>
+		<!-- IF S_CAN_NOTIFY -->
 		<br /><br />
 		<dl class="panel">
 			<dt>&nbsp;</dt>
 			<dd><label><input type="checkbox" name="notify_user" checked="checked" /> {L_NOTIFY_USER_WARN}</label></dd>
 		</dl>
+		<!-- ENDIF -->
 	</fieldset>
 
 	<span class="corners-bottom"><span></span></span></div>
diff --git a/phpBB/styles/subsilver2/template/mcp_warn_post.html b/phpBB/styles/subsilver2/template/mcp_warn_post.html
index 1ad5757f15..ef0595e48e 100644
--- a/phpBB/styles/subsilver2/template/mcp_warn_post.html
+++ b/phpBB/styles/subsilver2/template/mcp_warn_post.html
@@ -45,9 +45,11 @@
 <tr>
 	<td class="row1" align="center"><textarea name="warning" rows="10" cols="76">{L_WARNING_POST_DEFAULT}</textarea></td>
 </tr>
+<!-- IF S_CAN_NOTIFY -->
 <tr>
 	<td class="row1" align="center"><input type="checkbox" class="radio" name="notify_user" checked="checked" /><span class="genmed">{L_NOTIFY_USER_WARN}</span></td>
 </tr>
+<!-- ENDIF -->
 <tr>
 	<td class="cat" align="center"><input class="btnmain" type="submit" name="action[add_warning]" value="{L_SUBMIT}" />&nbsp;&nbsp;<input class="btnlite" type="reset" value="{L_RESET}" /></td>
 </tr>
diff --git a/phpBB/styles/subsilver2/template/mcp_warn_user.html b/phpBB/styles/subsilver2/template/mcp_warn_user.html
index 5e8c350935..bb77c91654 100644
--- a/phpBB/styles/subsilver2/template/mcp_warn_user.html
+++ b/phpBB/styles/subsilver2/template/mcp_warn_user.html
@@ -58,9 +58,11 @@
 <tr>
 	<td class="row1" align="center"><textarea name="warning" rows="10" cols="76"></textarea></td>
 </tr>
+<!-- IF S_CAN_NOTIFY -->
 <tr>
 	<td class="row1" align="center"><input type="checkbox" class="radio" name="notify_user" checked="checked" /><span class="genmed">{L_NOTIFY_USER_WARN}</span></td>
 </tr>
+<!-- ENDIF -->
 <tr>
 	<td class="cat" align="center"><input class="btnmain" type="submit" name="action[add_warning]" value="{L_SUBMIT}" />&nbsp;&nbsp;<input class="btnlite" type="reset" value="{L_RESET}" /></td>
 </tr>