diff -r 2fc1c25441f1 -r 7763892ed801 src/string.c
--- a/src/string.c	Tue May 27 22:31:06 2025 +0200
+++ b/src/string.c	Sun Jun 01 16:00:16 2025 +0200
@@ -42,7 +42,7 @@
 #endif
 
 cxmutstr cx_mutstr(char *cstring) {
-    return (cxmutstr) {cstring, strlen(cstring)};
+    return (cxmutstr) {cstring, cstring == NULL ? 0 : strlen(cstring)};
 }
 
 cxmutstr cx_mutstrn(
@@ -53,7 +53,7 @@
 }
 
 cxstring cx_str(const char *cstring) {
-    return (cxstring) {cstring, strlen(cstring)};
+    return (cxstring) {cstring, cstring == NULL ? 0 : strlen(cstring)};
 }
 
 cxstring cx_strn(