diff --git a/bindings/py3devil1tex.py b/bindings/py3devil1tex.py
index 32aeb7f..6300ed1 100644
--- a/bindings/py3devil1tex.py
+++ b/bindings/py3devil1tex.py
@@ -82,7 +82,8 @@ del libc
 class pyTexturePack:
     def __init__(self, filedata):
         self.cstruct = ctypes.pointer(TexturePack())
-        devil1tex.getheader(ctypes.byref(self.cstruct), filedata)
+        if not devil1tex.getheader(ctypes.byref(self.cstruct), filedata):
+            raise RuntimeError("failed to get texture pack header")
         return
 
     def show(self):
@@ -99,7 +100,12 @@ class pyTextureBatchDescriptor:
         self.cstruct = ctypes.pointer(TextureBatchDescriptor())
         ptrofptr = ctypes.byref(self.cstruct)
         if filedata:
-            devil1tex.getbatchdesc(ptrofptr, i, filedata, len(filedata))
+            if not devil1tex.getbatchdesc(
+                    ptrofptr, 
+                    i, 
+                    filedata, 
+                    len(filedata)):
+                raise RuntimeError("failed to get texturebatchdescriptor #" + str(i))
         return
 
     def show(self):
@@ -128,7 +134,12 @@ class pyTextureBatch:
             self.cstruct.batch = ctypes.cast(
                              ctypes.create_string_buffer(memsize), 
                              ctypes.POINTER(Texture))
-            devil1tex.gettextures(self.cstruct.batch, i, filedata, len(filedata))
+            if not devil1tex.gettextures(
+                    self.cstruct.batch, 
+                    i, 
+                    filedata, 
+                    len(filedata)):
+                raise RuntimeError("failed to get textures of batch #" + str(i))
         return
 
     def gettextures(self):