diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 2c4272323..7a1d14832 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -21,6 +21,7 @@ from lib.core.common import randomInt
 from lib.core.common import randomStr
 from lib.core.common import readInput
 from lib.core.common import showStaticWords
+from lib.core.common import wasLastRequestError
 from lib.core.common import DynamicContentItem
 from lib.core.convert import urlencode
 from lib.core.data import conf
@@ -103,7 +104,7 @@ def heuristicCheckSqlInjection(place, parameter, value):
         payload = conf.paramDict[place][parameter].replace('*', payload)
 
     Request.queryPage(payload, place)
-    result = kb.lastErrorPage and kb.lastErrorPage[0]==kb.lastRequestUID
+    result = wasLastRequestError()
 
     infoMsg  = "(error based) heuristics shows that %s " % place
     infoMsg += "parameter '%s' is " % parameter
diff --git a/lib/core/common.py b/lib/core/common.py
index 8d3eae7fe..0eae435a5 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -1479,7 +1479,19 @@ def commonFinderOnly(initial, sequence):
     return longestCommonPrefix(*filter(lambda x: x.startswith(initial), sequence))
 
 def pushValue(value):
+    """
+    Push value to the stack
+    """
     kb.valueStack.append(value)
 
 def popValue():
+    """
+    Pop value from the stack
+    """
     return kb.valueStack.pop()
+
+def wasLastRequestError():
+    """
+    Returns True if the last web request resulted in a (recognized) DBMS error page
+    """
+    return kb.lastErrorPage and kb.lastErrorPage[0]==kb.lastRequestUID
diff --git a/lib/core/option.py b/lib/core/option.py
index 0f4f9f188..521d22143 100644
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -1006,7 +1006,6 @@ def __setConfAttributes():
     conf.dbmsConnector    = None
     conf.dbmsHandler      = None
     conf.dumpPath         = None
-    conf.errorComparison  = True
     conf.minMatchBlock    = 8
     conf.dynMarkLength    = 32
     conf.httpHeaders      = []
diff --git a/lib/request/comparison.py b/lib/request/comparison.py
index afc9330c1..9e9fe449f 100644
--- a/lib/request/comparison.py
+++ b/lib/request/comparison.py
@@ -11,6 +11,7 @@ import re
 
 from lib.core.common import getFilteredPageContent
 from lib.core.common import preparePageForLineComparison
+from lib.core.common import wasLastRequestError
 from lib.core.data import conf
 from lib.core.data import kb
 from lib.core.data import logger
@@ -94,7 +95,7 @@ def comparison(page, headers=None, getSeqMatcher=False, pageLength=None):
         return ratio
 
     # In case of an DBMS error page return False
-    elif conf.errorComparison and kb.lastErrorPage and kb.lastErrorPage[0]==kb.lastRequestUID:
+    elif wasLastRequestError():
         return False
 
     # If the url is not stable it returns sequence matcher between the