diff --git a/lib/core/settings.py b/lib/core/settings.py
index 73b4894f5..8f64a00f8 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -19,7 +19,7 @@ from lib.core.enums import OS
 from lib.core.revision import getRevisionNumber
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.0.6.36"
+VERSION = "1.0.6.37"
 REVISION = getRevisionNumber()
 STABLE = VERSION.count('.') <= 2
 VERSION_STRING = "sqlmap/%s#%s" % (VERSION, "stable" if STABLE else "dev")
diff --git a/lib/request/inject.py b/lib/request/inject.py
index 0a2c6ee25..75bf95260 100644
--- a/lib/request/inject.py
+++ b/lib/request/inject.py
@@ -284,7 +284,7 @@ def _goInferenceProxy(expression, fromUser=False, batch=False, unpack=True, char
 
     outputs = _goInferenceFields(expression, expressionFields, expressionFieldsList, payload, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar, dump=dump)
 
-    return ", ".join(output for output in outputs) if not isNoneValue(outputs) else None
+    return ", ".join(output or "" for output in outputs) if not isNoneValue(outputs) else None
 
 def _goBooleanProxy(expression):
     """