diff --git a/scene/resources/dynamic_font.cpp b/scene/resources/dynamic_font.cpp
index f235676c7d4..4ceacf73d8c 100644
--- a/scene/resources/dynamic_font.cpp
+++ b/scene/resources/dynamic_font.cpp
@@ -256,6 +256,10 @@ Size2 DynamicFontAtSize::get_char_size(CharType p_char, CharType p_next, const V
 }
 
 String DynamicFontAtSize::get_available_chars() const {
+	if (!valid) {
+		return "";
+	}
+
 	String chars;
 
 	FT_UInt gindex;