diff --git a/lib/core/option.py b/lib/core/option.py
index 9fe9617cd..242eab549 100644
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -1998,6 +1998,10 @@ def _basicOptionValidation():
         errMsg = "option '--not-string' is incompatible with switch '--null-connection'"
         raise SqlmapSyntaxException(errMsg)
 
+    if conf.noCast and conf.hexConvert:
+        errMsg = "switch '--no-cast' is incompatible with switch '--hex'"
+        raise SqlmapSyntaxException(errMsg)
+
     if conf.string and conf.notString:
         errMsg = "option '--string' is incompatible with switch '--not-string'"
         raise SqlmapSyntaxException(errMsg)
diff --git a/lib/request/inject.py b/lib/request/inject.py
index 460a2d8ea..8d7c4e546 100644
--- a/lib/request/inject.py
+++ b/lib/request/inject.py
@@ -411,7 +411,7 @@ def getValue(expression, blind=True, union=True, error=True, time=True, fromUser
 
     if not kb.testMode and value is None and Backend.getDbms() and conf.dbmsHandler:
         warnMsg = "in case of continuous data retrieval problems you are advised to try "
-        warnMsg += "a switch '--no-cast' and/or switch '--hex'"
+        warnMsg += "a switch '--no-cast' or switch '--hex'"
         singleTimeWarnMessage(warnMsg)
 
     return extractExpectedValue(value, expected)