diff -up iniparser-4.1/src/iniparser.c.orig iniparser-4.1/src/iniparser.c
--- iniparser-4.1/src/iniparser.c.orig	2017-11-02 05:09:15.000000000 -0400
+++ iniparser-4.1/src/iniparser.c	2023-06-14 11:32:33.773972538 -0400
@@ -456,7 +456,7 @@ long int iniparser_getlongint(const dict
     const char * str ;
 
     str = iniparser_getstring(d, key, INI_INVALID_KEY);
-    if (str==INI_INVALID_KEY) return notfound ;
+    if (str==NULL || str==INI_INVALID_KEY) return notfound ;
     return strtol(str, NULL, 0);
 }
 
@@ -511,7 +511,7 @@ double iniparser_getdouble(const diction
     const char * str ;
 
     str = iniparser_getstring(d, key, INI_INVALID_KEY);
-    if (str==INI_INVALID_KEY) return notfound ;
+    if (str==NULL || str==INI_INVALID_KEY) return notfound ;
     return atof(str);
 }
 
@@ -553,7 +553,7 @@ int iniparser_getboolean(const dictionar
     const char * c ;
 
     c = iniparser_getstring(d, key, INI_INVALID_KEY);
-    if (c==INI_INVALID_KEY) return notfound ;
+    if (c==NULL || c==INI_INVALID_KEY) return notfound ;
     if (c[0]=='y' || c[0]=='Y' || c[0]=='1' || c[0]=='t' || c[0]=='T') {
         ret = 1 ;
     } else if (c[0]=='n' || c[0]=='N' || c[0]=='0' || c[0]=='f' || c[0]=='F') {