diff --git a/gramps/plugins/webreport/basepage.py b/gramps/plugins/webreport/basepage.py
index e37673a7b..8d7fc5b08 100644
--- a/gramps/plugins/webreport/basepage.py
+++ b/gramps/plugins/webreport/basepage.py
@@ -2878,6 +2878,16 @@ class BasePage:
             tbody += trow
 
         data = place.get_latitude()
+        v_lat, v_lon = conv_lat_lon(data, "0.0", "D.D8")
+        if not v_lat:
+            data += self._(":")
+            # We use the same message as in:
+            # gramps/gui/editors/editplace.py
+            # gramps/gui/editors/editplaceref.py
+            data += self._("Invalid latitude\n(syntax: 18\\u00b09'48.21\"S,"
+                           " -18.2412 or -18:9:48.21)")
+            # We need to convert "\\u00b0" to "°" for html
+            data = data.replace("\\u00b0", "°")
         if data != "":
             trow = Html('tr') + (
                 Html("td", self._("Latitude"), class_="ColumnAttribute",
@@ -2886,6 +2896,16 @@ class BasePage:
             )
             tbody += trow
         data = place.get_longitude()
+        v_lat, v_lon = conv_lat_lon("0.0", data, "D.D8")
+        if not v_lon:
+            data += self._(":")
+            # We use the same message as in:
+            # gramps/gui/editors/editplace.py
+            # gramps/gui/editors/editplaceref.py
+            data += self._("Invalid longitude\n(syntax: 18\\u00b09'48.21\"E,"
+                           " -18.2412 or -18:9:48.21)")
+            # We need to convert "\\u00b0" to "°" for html
+            data = data.replace("\\u00b0", "°")
         if data != "":
             trow = Html('tr') + (
                 Html("td", self._("Longitude"), class_="ColumnAttribute",
diff --git a/gramps/plugins/webreport/place.py b/gramps/plugins/webreport/place.py
index dada44daa..2b8adca2b 100644
--- a/gramps/plugins/webreport/place.py
+++ b/gramps/plugins/webreport/place.py
@@ -495,11 +495,14 @@ class PlacePages(BasePage):
 
             # Begin inline javascript code because jsc is a
             # docstring, it does NOT have to be properly indented
+            latitude, longitude = conv_lat_lon(place.get_latitude(),
+                                               place.get_longitude(),
+                                               "D.D8")
+            if not (latitude and longitude):
+                # We have incorrect longitude and/or latitude for this place.
+                latitude = longitude = 0.0
             if self.placemappages:
                 if place and (place.lat and place.long):
-                    latitude, longitude = conv_lat_lon(place.get_latitude(),
-                                                       place.get_longitude(),
-                                                       "D.D8")
                     tracelife = " "
                     if self.create_media and media_list:
                         for fmedia in media_list: