diff --git a/printer_webui/util/comm.py b/printer_webui/util/comm.py
index 80f5d2d..147d78b 100644
--- a/printer_webui/util/comm.py
+++ b/printer_webui/util/comm.py
@@ -469,7 +469,7 @@ class MachineCom(object):
 				pass
 		if 'M140' in cmd or 'M190' in cmd:
 			try:
-				self._bedTargetTemp = float(re.search('S([0-9]+)').group(1))
+				self._bedTargetTemp = float(re.search('S([0-9]+)', cmd).group(1))
 			except:
 				pass
 		self._log('Send: %s' % (cmd))