diff --git a/MagickCore/color-private.h b/MagickCore/color-private.h
index 79d997eec46..32b8f79619d 100644
--- a/MagickCore/color-private.h
+++ b/MagickCore/color-private.h
@@ -43,6 +43,8 @@ static inline MagickBooleanType GetColorRange(const char *color,
   MagickBooleanType
     status;
 
+  if (color == (const char *) NULL)
+    return(MagickFalse);
   if (*color != '\0')
     {
       char
diff --git a/MagickCore/string-private.h b/MagickCore/string-private.h
index 6314bf7b6a6..465f3e1016f 100644
--- a/MagickCore/string-private.h
+++ b/MagickCore/string-private.h
@@ -102,11 +102,15 @@ static inline double StringToDoubleInterval(const char *string,
 
 static inline int StringToInteger(const char *magick_restrict value)
 {
+  if (value == (const char *) NULL)
+    return(0);
   return((int) strtol(value,(char **) NULL,10));
 }
 
 static inline long StringToLong(const char *magick_restrict value)
 {
+  if (value == (const char *) NULL)
+    return(0);
   return(strtol(value,(char **) NULL,10));
 }
 
@@ -136,6 +140,8 @@ static inline size_t StringToSizeType(const char *string,const double interval)
 static inline unsigned long StringToUnsignedLong(
   const char *magick_restrict value)
 {
+  if (value == (const char *) NULL)
+    return(0);
   return(strtoul(value,(char **) NULL,10));
 }
 
diff --git a/MagickCore/utility-private.h b/MagickCore/utility-private.h
index f2604f0690e..f12b5fae771 100644
--- a/MagickCore/utility-private.h
+++ b/MagickCore/utility-private.h
@@ -133,6 +133,8 @@ static inline wchar_t *create_wchar_mode(const char *mode)
 
 static inline int access_utf8(const char *path,int mode)
 {
+  if (path == (const char *) NULL)
+    return(-1);
 #if !defined(MAGICKCORE_WINDOWS_SUPPORT) || defined(__CYGWIN__)
   return(access(path,mode));
 #else
diff --git a/MagickWand/mogrify.c b/MagickWand/mogrify.c
index ab4f253e51c..8eca83a32fb 100644
--- a/MagickWand/mogrify.c
+++ b/MagickWand/mogrify.c
@@ -4066,6 +4066,8 @@ WandExport MagickBooleanType MogrifyImageCommand(ImageInfo *image_info,
           AppendImageFormat(format,images->filename);
         AppendImageStack(images);
         FinalizeImageSettings(image_info,image,MagickFalse);
+        if (image == (Image *) NULL)
+          continue;
         if (global_colormap != MagickFalse)
           {
             QuantizeInfo
diff --git a/MagickWand/operation.c b/MagickWand/operation.c
index f934f8a44ff..ff246bc84bf 100644
--- a/MagickWand/operation.c
+++ b/MagickWand/operation.c
@@ -1085,6 +1085,8 @@ WandPrivate void CLISettingOptionInfo(MagickCLI *cli_wand,
       if (LocaleCompare("log",option+1) == 0)
         {
           if (IfSetOption) {
+            if (arg1 == (char *) NULL)
+              break;
             if ((strchr(arg1,'%') == (char *) NULL))
               CLIWandExceptArgBreak(OptionError,"InvalidArgument",option,arg1);
             (void) SetLogFormat(arg1);
@@ -3124,6 +3126,8 @@ static MagickBooleanType CLISimpleOperatorImage(MagickCLI *cli_wand,
           max_threshold=geometry_info.sigma;
           if ((flags & SigmaValue) == 0)
             max_threshold=min_threshold;
+          if (arg1 == (char *) NULL)
+            break;
           if (strchr(arg1,'%') != (char *) NULL)
             {
               max_threshold*=(double) (0.01*QuantumRange);
@@ -4204,6 +4208,8 @@ WandPrivate MagickBooleanType CLIListOperatorImages(MagickCLI *cli_wand,
                 CLIWandExceptArgBreak(OptionError,"InvalidArgument",option,
                   arg1);
               number_duplicates=(size_t) StringToLong(arg1);
+              if (arg1 == (char *) NULL)
+                break;
               p=strchr(arg1,',');
               if (p == (const char *) NULL)
                 new_images=DuplicateImages(_images,number_duplicates,"-1",
diff --git a/MagickWand/script-token.c b/MagickWand/script-token.c
index a8e5d447bbc..1a4191caf0e 100644
--- a/MagickWand/script-token.c
+++ b/MagickWand/script-token.c
@@ -337,6 +337,8 @@ WandExport ScriptTokenInfo * DestroyScriptTokenInfo(ScriptTokenInfo *token_info)
 #define SaveChar(c) \
 { \
   if ((size_t) offset >= (token_info->length-1)) { \
+    if (token_info == (ScriptTokenInfo *) NULL) \
+      break; \
     if ( token_info->length >= MagickPathExtent ) \
       token_info->length += MagickPathExtent; \
     else \
@@ -348,7 +350,10 @@ WandExport ScriptTokenInfo * DestroyScriptTokenInfo(ScriptTokenInfo *token_info)
       break; \
     } \
   } \
-  token_info->token[offset++]=(char) (c); \
+  if ( token_info->token == (char *) NULL ) \
+    token_info->status=TokenStatusMemoryFailed; \
+  else \
+    token_info->token[offset++]=(char) (c); \
 }
 
 WandExport MagickBooleanType GetScriptToken(ScriptTokenInfo *token_info)