diff --git a/rowers/models.py b/rowers/models.py
index 5e0af42b..0a9a7eda 100644
--- a/rowers/models.py
+++ b/rowers/models.py
@@ -1238,38 +1238,59 @@ class RowerForm(ModelForm):
 	try:
 	    rest = self.cleaned_data['rest']
 	except:
-	    rest = int(self.data['rest'])
+            try:
+	        rest = int(self.data['rest'])
+            except ValueError:
+                rest = 0
 
 	try:
 	    ut2 = self.cleaned_data['ut2']
 	except:
-	    ut2 = self.data['ut2']
+            try:
+	        ut2 = self.data['ut2']
+            except ValueError:
+                ut2 = 0
 
 	try:
 	    ut1 = self.cleaned_data['ut1']
 	except:
-	    ut1 = self.data['ut1']
+            try:
+	        ut1 = self.data['ut1']
+            except ValueError:
+                ut1 = 0
 
 	try:
 	    at = self.cleaned_data['at']
 	except:
-	    at = self.data['at']
+            try:
+	        at = self.data['at']
+            except ValueError:
+                at = 0
 
 	try:
 	    an = self.cleaned_data['an']
 	except:
-	    an = self.data['an']
+            try:
+	        an = self.data['an']
+            except ValueError:
+                an = 0
 
 	try:
 	    tr = self.cleaned_data['tr']
 	except:
-	    tr = self.data['tr']
+            try:
+	        tr = self.data['tr']
+            except ValueError:
+                tr = 0
 
 	try:
 	    max = self.cleaned_data['max']
 	except:
-	    max = self.data['max']
-	
+            try:
+	        max = self.data['max']
+            except ValueError:
+                max = 0
+	        
 	if rest>=ut2:
 	    raise forms.ValidationError("Resting heart rate should be lower than UT2")
 	if ut2>=ut1: