diff --git a/pdfminer/psparser.py b/pdfminer/psparser.py
index a40eaa9..b15ab44 100644
--- a/pdfminer/psparser.py
+++ b/pdfminer/psparser.py
@@ -369,7 +369,10 @@ class PSBaseParser(object):
             return len(s)
         j = m.start(0)
         self._curtoken += s[i:j]
-        self._add_token(float(self._curtoken))
+        try:
+            self._add_token(float(self._curtoken))
+        except ValueError:
+            pass
         self._parse1 = self._parse_main
         return j