diff --git a/orangecontrib/geo/widgets/owchoropleth.py b/orangecontrib/geo/widgets/owchoropleth.py
index 3d3b5b4..daa6d26 100644
--- a/orangecontrib/geo/widgets/owchoropleth.py
+++ b/orangecontrib/geo/widgets/owchoropleth.py
@@ -686,7 +686,10 @@ def effective_variables(self):
 
     @property
     def effective_data(self):
-        return self.data.transform(Domain(self.effective_variables))
+        eff_var = self.effective_variables
+        if eff_var and self.attr_lat.name == self.attr_lon.name:
+            eff_var = [self.attr_lat]
+        return self.data.transform(Domain(eff_var))
 
     # Input
     @Inputs.data
diff --git a/orangecontrib/geo/widgets/owmap.py b/orangecontrib/geo/widgets/owmap.py
index 976565d..63e9ba3 100644
--- a/orangecontrib/geo/widgets/owmap.py
+++ b/orangecontrib/geo/widgets/owmap.py
@@ -1,6 +1,6 @@
 import numpy as np
 from AnyQt.QtCore import Qt
-from Orange.data import Table, ContinuousVariable
+from Orange.data import Table, Domain, ContinuousVariable
 from Orange.widgets import gui, settings
 from Orange.widgets.utils.widgetpreview import WidgetPreview
 from Orange.widgets.utils.itemmodels import DomainModel
@@ -228,6 +228,13 @@ def effective_variables(self):
         return [self.attr_lat, self.attr_lon] \
             if self.attr_lat and self.attr_lon else []
 
+    @property
+    def effective_data(self):
+        eff_var = self.effective_variables
+        if eff_var and self.attr_lat.name == self.attr_lon.name:
+            eff_var = [self.attr_lat]
+        return self.data.transform(Domain(eff_var))
+
     def showEvent(self, ev):
         super().showEvent(ev)
         # reset the map on show event since before that we didn't know the