--- fvwm/builtins.c
+++ fvwm/builtins.c
@@ -2884,7 +2884,7 @@
 	int ret;
 	unsigned long argument, data1 = 0, data2 = 0;
 
-	if (action == NULL || action == "\0")
+	if (action == NULL || action[0] == '\0')
 	{
 		return;
 	}
--- libs/Flocale.c
+++ libs/Flocale.c
@@ -1066,21 +1066,22 @@
 	FftFontType *fftf = NULL;
 	FlocaleFont *flf = NULL;
 	char *fn, *hints = NULL;
+	char *fallback_font = FLOCALE_FFT_FALLBACK_FONT;
 
 	hints = GetQuotedString(fontname, &fn, "/", NULL, NULL, NULL);
 	if (fn == NULL)
 	{
-		fn = FLOCALE_FFT_FALLBACK_FONT;
+		fn = fallback_font;
 	}
 	else if (*fn == '\0')
 	{
 		free(fn);
-		fn = FLOCALE_FFT_FALLBACK_FONT;
+		fn = fallback_font;
 	}
 	fftf = FftGetFont(dpy, fn, module);
 	if (fftf == NULL)
 	{
-		if (fn != NULL && fn != FLOCALE_FFT_FALLBACK_FONT)
+		if (fn != NULL && fn != fallback_font)
 		{
 			free(fn);
 		}
@@ -1095,7 +1096,7 @@
 		&flf->fftf, &flf->height, &flf->ascent, &flf->descent);
 	FftGetFontWidths(flf, &flf->max_char_width);
 	free(fftf);
-	if (fn != NULL && fn != FLOCALE_FFT_FALLBACK_FONT)
+	if (fn != NULL && fn != fallback_font)
 	{
 		free(fn);
 	}
@@ -1115,16 +1116,17 @@
 	char *ds;
 	XFontSetExtents *fset_extents;
 	char *fn, *hints = NULL, *fn_fixed = NULL;
+	char *fallback_font = FLOCALE_MB_FALLBACK_FONT;
 
 	hints = GetQuotedString(fontname, &fn, "/", NULL, NULL, NULL);
 	if (*fn == '\0')
 	{
 		free(fn);
-		fn = fn_fixed = FLOCALE_MB_FALLBACK_FONT;
+		fn = fn_fixed = fallback_font;
 	}
 	else if (!(fn_fixed = FlocaleFixNameForFontSet(dpy, fn, module)))
 	{
-		if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT)
+		if (fn != NULL && fn != fallback_font)
 		{
 			free(fn);
 		}
@@ -1136,7 +1138,7 @@
 		{
 			free(fn_fixed);
 		}
-		if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT)
+		if (fn != NULL && fn != fallback_font)
 		{
 			free(fn);
 		}
@@ -1185,7 +1187,7 @@
 	{
 		free(fn_fixed);
 	}
-	if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT)
+	if (fn != NULL && fn != fallback_font)
 	{
 		free(fn);
 	}
@@ -1201,6 +1203,7 @@
 	FlocaleFont *flf;
 	char *str,*fn,*tmp;
 	char *hints = NULL;
+	char *fallback_font = FLOCALE_FALLBACK_FONT;
 
 	hints = GetQuotedString(fontname, &tmp, "/", NULL, NULL, NULL);
 	str = GetQuotedString(tmp, &fn, ",", NULL, NULL, NULL);
@@ -1209,10 +1212,10 @@
 		if (*fn == '\0')
 		{
 			free(fn);
-			fn = FLOCALE_FALLBACK_FONT;
+			fn = fallback_font;
 		}
 		font = XLoadQueryFont(dpy, fn);
-		if (fn != NULL && fn != FLOCALE_FALLBACK_FONT)
+		if (fn != NULL && fn != fallback_font)
 		{
 			free(fn);
 			fn = NULL;
@@ -1224,7 +1227,7 @@
 	}
 	if (font == NULL)
 	{
-		if (fn != NULL && fn != FLOCALE_FALLBACK_FONT)
+		if (fn != NULL && fn != fallback_font)
 		{
 			free(fn);
 		}
@@ -1248,7 +1251,7 @@
 	flf->max_char_width = font->max_bounds.width;
 	if (flf->font->max_byte1 > 0)
 		flf->flags.is_mb = True;
-	if (fn != NULL && fn != FLOCALE_FALLBACK_FONT)
+	if (fn != NULL && fn != fallback_font)
 	{
 		free(fn);
 	}
@@ -1382,6 +1385,8 @@
 	int shadow_offset = 0;
 	int shadow_dir = MULTI_DIR_SE;
 	int i;
+	char *mb_fallback_font = FLOCALE_MB_FALLBACK_FONT;
+	char *fallback_font = FLOCALE_FALLBACK_FONT;
 
 	/* removing quoting for modules */
 	if (fontname && (t = strchr("\"'`", *fontname)))
@@ -1395,7 +1400,7 @@
 	if (fontname == NULL || *fontname == 0)
 	{
 		ask_default = True;
-		fontname = FLOCALE_MB_FALLBACK_FONT;
+		fontname = mb_fallback_font;
 	}
 
 	while (flf)
@@ -1454,14 +1459,14 @@
 	}
 	else
 	{
-		fn = FLOCALE_MB_FALLBACK_FONT;
+		fn = mb_fallback_font;
 	}
 	while (!flf && (fn && *fn))
 	{
 		flf = FlocaleGetFontOrFontSet(
 			dpy, fn, encoding, fontname, module);
-		if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT &&
-		    fn != FLOCALE_FALLBACK_FONT)
+		if (fn != NULL && fn != mb_fallback_font &&
+		    fn != fallback_font)
 		{
 			free(fn);
 			fn = NULL;
@@ -1471,8 +1476,7 @@
 			str = GetQuotedString(str, &fn, ";", NULL, NULL, NULL);
 		}
 	}
-	if (fn != NULL && fn != FLOCALE_MB_FALLBACK_FONT &&
-	    fn != FLOCALE_FALLBACK_FONT)
+	if (fn != NULL && fn != mb_fallback_font && fn != fallback_font)
 	{
 		free(fn);
 	}