Index: frontends/php/include/classes/html/CTag.php
===================================================================
--- frontends/php/include/classes/html/CTag.php	(revision 63139)
+++ frontends/php/include/classes/html/CTag.php	(revision 63140)
@@ -166,23 +166,24 @@
 	 *													Syntax:
 	 *														property1: value1; property2: value2; property(n): value(n)
 	 *
-	 * @return bool
+	 * @return CTag
 	 */
 	public function setHint($text, $span_class = '', $freeze_on_click = true, $styles = '') {
-		if (empty($text)) {
-			return $this;
-		}
+		$id = 'hintbox_'.uniqid();
 
-		encodeValues($text);
-		$text = unpack_object($text);
+		$this->addItem(
+			(new CSpan(
+				(new CSpan($text))->setId($id)
+			))->setAttribute('style', 'display: none;')
+		);
 
 		$this->onMouseover(
-			'hintBox.HintWraper(event, this, '.zbx_jsvalue($text).', "'.$span_class.'", "'.$styles.'");'
+			'hintBox.HintWraper(event, this, jQuery("#'.$id.'"), "'.$span_class.'", "'.$styles.'");'
 		);
 
 		if ($freeze_on_click) {
 			$this->onClick(
-				'hintBox.showStaticHint(event, this, '.zbx_jsvalue($text).', "'.$span_class.'", false, "'.$styles.'");'
+				'hintBox.showStaticHint(event, this, jQuery("#'.$id.'"), "'.$span_class.'", false, "'.$styles.'");'
 			);
 		}
 
Index: frontends/php/include/html.inc.php
===================================================================
--- frontends/php/include/html.inc.php	(revision 63139)
+++ frontends/php/include/html.inc.php	(revision 63140)
@@ -594,10 +594,14 @@
 				$ai = (new CSpan($type))->addClass(ZBX_STYLE_STATUS_GREEN);
 				break;
 			case HOST_AVAILABLE_FALSE:
-				$ai = (new CSpan($type))
-					->addClass(ZBX_STYLE_STATUS_RED)
-					->addClass(ZBX_STYLE_CURSOR_POINTER)
-					->setHint($host[$prefix.'error'], ZBX_STYLE_RED);
+				$ai = (new CSpan($type))->addClass(ZBX_STYLE_STATUS_RED);
+
+				if ($host[$prefix.'error'] !== '') {
+					$ai = (new CSpan($type))
+						->addClass(ZBX_STYLE_CURSOR_POINTER)
+						->setHint($host[$prefix.'error'], ZBX_STYLE_RED);
+				}
+
 				break;
 			case HOST_AVAILABLE_UNKNOWN:
 				$ai = (new CSpan($type))->addClass(ZBX_STYLE_STATUS_GREY);