diff --git a/src/qibocal/protocols/characterization/two_qubit_interaction/chsh/utils.py b/src/qibocal/protocols/characterization/two_qubit_interaction/chsh/utils.py
index d18fc97d7..0f38a3589 100644
--- a/src/qibocal/protocols/characterization/two_qubit_interaction/chsh/utils.py
+++ b/src/qibocal/protocols/characterization/two_qubit_interaction/chsh/utils.py
@@ -1,5 +1,7 @@
 """Auxiliary functions to run CHSH protocol."""
 
+from qibo.config import log
+
 READOUT_BASIS = ["ZZ", "ZX", "XZ", "XX"]
 
 
@@ -20,4 +22,5 @@ def compute_chsh(frequencies, basis, i):
     try:
         return chsh / nshots
     except ZeroDivisionError:
+        log.warning("Zero number of shots, returning zero.")
         return 0