diff --git a/simple_mobile_redirect.module b/simple_mobile_redirect.module
index 425205d..d69aa86 100644
--- a/simple_mobile_redirect.module
+++ b/simple_mobile_redirect.module
@@ -116,7 +116,7 @@ function simple_mobile_redirect_boot() {
     // check if any of the values listed create a match on the user agent - these are some of the most common terms used in agents to identify them as being mobile devices
     case (preg_match('/(mini 9.5|vx1000|lge |m800|e860|u940|ux840|compal|wireless| mobi|ahong|lg380|lgku|lgu900|lg210|lg47|lg920|lg840|lg370|sam-r|mg50|s55|g83|t66|vx400|mk99|d615|d763|el370|sl900|mp500|samu3|samu4|vx10|xda_|samu5|samu6|samu7|samu9|a615|b832|m881|s920|n210|s700|c-810|_h797|mob-x|sk16d|848b|mowser|s580|r800|471x|v120|rim8|c500foma:|160x|x160|480x|x640|t503|w839|i250|sprint|w398samr810|m5252|c7100|mt126|x225|s5330|s820|htil-g1|fly v71|s302|-x113|novarra|k610i|-three|8325rc|8352rc|sanyo|vx54|c888|nx250|n120|mtk |c5588|s710|t880|c5005|i;458x|p404i|s210|c5100|teleca|s940|c500|s590|foma|samsu|vx8|vx9|a1000|_mms|myx|a700|gu1100|bc831|e300|ems100|me701|me702m-three|sd588|s800|8325rc|ac831|mw200|brew |d88|htc\/|htc_touch|355x|m50|km100|d736|p-9521|telco|sl74|ktouch|m4u\/|me702|8325rc|kddi|phone|lg |sonyericsson|samsung|240x|x320|vx10|nokia|sony cmd|motorola|up.browser|up.link|mmp|symbian|smartphone|midp|wap|vodafone|o2|pocket|kindle|mobile|psp|treo)/i', $user_agent)):
     // is the device showing signs of support for text/vnd.wap.wml or application/vnd.wap.xhtml+xml
-    case ((strpos($_SERVER['HTTP_ACCEPT'], 'text/vnd.wap.wml') > 0) || (strpos($_SERVER['HTTP_ACCEPT'], 'application/vnd.wap.xhtml+xml') > 0)):
+    case ((strpos(isset($_SERVER['HTTP_ACCEPT’]), 'text/vnd.wap.wml') > 0) || (strpos(isset($_SERVER['HTTP_ACCEPT’]), 'application/vnd.wap.xhtml+xml') > 0)):
     // is the device giving us a HTTP_X_WAP_PROFILE or HTTP_PROFILE header - only mobile devices would do this
     case (isset($_SERVER['HTTP_X_WAP_PROFILE']) || isset($_SERVER['HTTP_PROFILE'])):
       $simplemobileredirect = variable_get('simple_mobile_redirect_mobileredirect', '');