diff --git a/orangecontrib/xoppy/widgets/optics/xcrystal.py b/orangecontrib/xoppy/widgets/optics/xcrystal.py
index 1a708fe..c561654 100644
--- a/orangecontrib/xoppy/widgets/optics/xcrystal.py
+++ b/orangecontrib/xoppy/widgets/optics/xcrystal.py
@@ -363,7 +363,7 @@ def do_xoppy_calculation(self):
             emin = self.ENERGY - 100.0
             emax = self.ENERGY + 100.0
 
-        estep = (emax - emin) / self.SCANPOINTS
+        estep = (emax - emin) / 500 # the preprocessor data is limited to NMAXENER=1000
         preprocessor_file = "xcrystal.bra"
 
         print("Using crystal descriptor: ", descriptor)
diff --git a/setup.py b/setup.py
index 782af9c..2e885b6 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
     from setuptools import find_packages, setup
 
 NAME = 'OASYS1-XOPPY'
-VERSION = '1.2.3'
+VERSION = '1.2.4'
 ISRELEASED = False
 
 DESCRIPTION = 'XOPPY: XOP (X-ray oriented programs) in Python'