diff --git a/core/utils.py b/core/utils.py
index 7053338..e228017 100644
--- a/core/utils.py
+++ b/core/utils.py
@@ -106,7 +106,7 @@ def infer_country_from_callsign(call):
     # Couldn't get anything from Clublog database, try QRZCQ data
     if not country:
         qrzcq_data = get_qrzcq_data_for_callsign(call)
-        if qrzcq_data and qrzcq_data["country"]:
+        if qrzcq_data and "country" in qrzcq_data:
             country = qrzcq_data["country"]
     return country
 
@@ -136,7 +136,7 @@ def infer_dxcc_id_from_callsign(call):
     # Couldn't get anything from Clublog database, try QRZCQ data
     if not dxcc:
         qrzcq_data = get_qrzcq_data_for_callsign(call)
-        if qrzcq_data and qrzcq_data["dxcc"]:
+        if qrzcq_data and "dxcc" in qrzcq_data:
             dxcc = qrzcq_data["dxcc"]
     return dxcc
 
@@ -160,7 +160,7 @@ def infer_continent_from_callsign(call):
     # Couldn't get anything from Clublog database, try QRZCQ data
     if not continent:
         qrzcq_data = get_qrzcq_data_for_callsign(call)
-        if qrzcq_data and qrzcq_data["continent"]:
+        if qrzcq_data and "continent" in qrzcq_data:
             continent = qrzcq_data["continent"]
     return continent
 
@@ -189,7 +189,7 @@ def infer_cq_zone_from_callsign(call):
     # Couldn't get anything from Clublog database, try QRZCQ data
     if not cqz:
         qrzcq_data = get_qrzcq_data_for_callsign(call)
-        if qrzcq_data and qrzcq_data["cqz"]:
+        if qrzcq_data and "cqz" in qrzcq_data:
             cqz = qrzcq_data["cqz"]
     return cqz
 
@@ -209,7 +209,7 @@ def infer_itu_zone_from_callsign(call):
     # Couldn't get anything from QRZ.com database, Clublog doesn't provide this, so try QRZCQ data
     if not ituz:
         qrzcq_data = get_qrzcq_data_for_callsign(call)
-        if qrzcq_data and qrzcq_data["ituz"]:
+        if qrzcq_data and "ituz" in qrzcq_data:
             ituz = qrzcq_data["ituz"]
     return ituz