diff --git a/src/pyFAI/ext/CSR_common.pxi b/src/pyFAI/ext/CSR_common.pxi
index 5e84f350c..101fc64ca 100644
--- a/src/pyFAI/ext/CSR_common.pxi
+++ b/src/pyFAI/ext/CSR_common.pxi
@@ -859,8 +859,9 @@ cdef class CsrIntegrator(object):
                 for i in range(start, stop):
                     former_element = element
                     element = work[i]
-                    if ((qmin<=former_element.s0) and (element.s0 <= qmax)) or \
-                       ((qmin>=former_element.s0)  and (element.s0 >= qmax)):   #specific case where qmin==qmax
+                    if ((element.s3!=0) and 
+                        (((qmin<=former_element.s0) and (element.s0 <= qmax)) or 
+                        ((qmin>=former_element.s0)  and (element.s0 >= qmax))):   #specific case where qmin==qmax
                         acc_sig = acc_sig + element.s1
                         acc_var = acc_var + element.s2
                         acc_norm = acc_norm + element.s3