diff --git a/mustergenerator.py b/mustergenerator.py
index fd403e3..a905875 100644
--- a/mustergenerator.py
+++ b/mustergenerator.py
@@ -7,6 +7,7 @@ class Circle:
     def __init__(self, name: str, filepath: str, length=1000, height=1000, radius=10, distance=60, offset=50):
         # run validations
         assert length >= 0, "length can not be negative"
+        assert height >= 0, "height can not be negative"
         assert radius >= 0, "radius can not be negative"
         assert distance >= 2*radius, "distance must be grater den two times the radius"
         assert offset >= 0, "offset can only be 0 - 100 %"
@@ -28,6 +29,7 @@ class Circle:
 
     @length.setter
     def length(self, val):
+        assert length >= 0, "length can not be negative"
         self.__length = val
 
     @property
@@ -36,6 +38,7 @@ class Circle:
 
     @height.setter
     def height(self, val):
+        assert height >= 0, "height can not be negative"
         self.__height = val
 
     @property
@@ -44,6 +47,7 @@ class Circle:
 
     @radius.setter
     def radius(self, val):
+        assert radius >= 0, "radius can not be negative"
         self.__radius = val
     @property
     def distance(self):
@@ -51,6 +55,7 @@ class Circle:
 
     @distance.setter
     def distance(self, val):
+        assert distance >= 2 * radius, "distance must be grater den two times the radius"
         self.__distance = val
 
     @property
@@ -63,9 +68,10 @@ class Circle:
 
     @offset.setter
     def offset(self, val):
+        assert offset >= 0, "offset can only be 0 - 100 %"
+        assert offset <= 100, "offset can only be 0 - 100 %"
         self.__offset = (self.__distance / 100) * val
 
-
     def circle_generation(self):
 
         x1 = 10