diff --git a/src/Model/WeatherParameters/WeatherParameters.py b/src/Model/WeatherParameters/WeatherParameters.py
index 881ab35f..b3637636 100644
--- a/src/Model/WeatherParameters/WeatherParameters.py
+++ b/src/Model/WeatherParameters/WeatherParameters.py
@@ -613,17 +613,24 @@ class WeatherParameters(SQLSubModel):
         new_0 = self._default_0
         new_1 = self._default_1
 
+        def convert(column, value, default):
+            if value.strip() == "":
+                return default
+            return self._types[column](value.replace(",", "."))
+
         if len(header) != 0:
             for i in [0, 1]:
                 for j in range(len(header)):
-                    if self._header[i] == header[j]:
+                    if self._header[i] == header[j] and j < len(data):
                         if i == 0:
-                            new_0 = self._types[i](data[j].replace(",", "."))
+                            new_0 = convert(i, data[j], new_0)
                         else:
-                            new_1 = self._types[i](data[j].replace(",", "."))
+                            new_1 = convert(i, data[j], new_1)
         else:
-            new_0 = self._types[0](data[0].replace(",", "."))
-            new_1 = self._types[1](data[1].replace(",", "."))
+            if len(data) > 0:
+                new_0 = convert(0, data[0], new_0)
+            if len(data) > 1:
+                new_1 = convert(1, data[1], new_1)
 
         return Data(new_0, new_1, status=self._status)