diff --git a/src/checkbufferoverrun.cpp b/src/checkbufferoverrun.cpp
index 70ed7c5a1..9e1a038f6 100644
--- a/src/checkbufferoverrun.cpp
+++ b/src/checkbufferoverrun.cpp
@@ -93,7 +93,7 @@ void CheckBufferOverrun::bufferOverrun(const Token *tok)
 
 void CheckBufferOverrun::dangerousStdCin(const Token *tok)
 {
-    if (_settings->_showAll == false)
+    if (_settings && _settings->_showAll == false)
         return;
 
     reportError(tok, Severity::possibleError, "dangerousStdCin", "Dangerous usage of std::cin, possible buffer overrun");
@@ -101,7 +101,7 @@ void CheckBufferOverrun::dangerousStdCin(const Token *tok)
 
 void CheckBufferOverrun::strncatUsage(const Token *tok)
 {
-    if (_settings->_showAll == false)
+    if (_settings && _settings->_showAll == false)
         return;
 
     reportError(tok, Severity::possibleError, "strncatUsage", "Dangerous usage of strncat. Tip: the 3rd parameter means maximum number of characters to append");
@@ -114,7 +114,7 @@ void CheckBufferOverrun::outOfBounds(const Token *tok, const std::string &what)
 
 void CheckBufferOverrun::sizeArgumentAsChar(const Token *tok)
 {
-    if (_settings->_showAll == false)
+    if (_settings && _settings->_showAll == false)
         return;
 
     reportError(tok, Severity::possibleError, "sizeArgumentAsChar", "The size argument is given as a char constant");