--- /usr/share/inkscape/extensions/funcplot.py~	2009-10-15 02:59:36.000000000 +0100
+++ /usr/share/inkscape/extensions/funcplot.py	2010-02-03 22:06:54.937821247 +0000
@@ -70,10 +70,14 @@
         ytop = (bottom+height-yzero)/scaley
 
     # functions specified by the user
-    if fx != "":
-        f = eval('lambda x: ' + fx.strip('"'))
-    if fpx != "":
-        fp = eval('lambda x: ' + fpx.strip('"'))
+    try:
+        if fx != "":
+            f = eval('lambda x: ' + fx.strip('"'))
+        if fpx != "":
+            fp = eval('lambda x: ' + fpx.strip('"'))
+    # handle incomplete/invalid function gracefully
+    except SyntaxError:
+	return []
 
     # step is the distance between nodes on x
     step = (xend - xstart) / (samples-1)