diff --git a/doc/classes/TextEdit.xml b/doc/classes/TextEdit.xml
index 7a5c485419..fe4266fd48 100644
--- a/doc/classes/TextEdit.xml
+++ b/doc/classes/TextEdit.xml
@@ -347,7 +347,8 @@
 		<method name="get_line_height" qualifiers="const">
 			<return type="int" />
 			<description>
-				Returns the height of a largest line.
+				Returns the maximum value of the line height among all lines.
+				[b]Note:[/b] The return value is influenced by [theme_item line_spacing] and [theme_item font_size]. And it will not be less than [code]1[/code].
 			</description>
 		</method>
 		<method name="get_line_width" qualifiers="const">
diff --git a/scene/gui/text_edit.cpp b/scene/gui/text_edit.cpp
index 310177dda7..9eee517780 100644
--- a/scene/gui/text_edit.cpp
+++ b/scene/gui/text_edit.cpp
@@ -3001,6 +3001,9 @@ void TextEdit::_update_caches() {
 	outline_color = get_theme_color(SNAME("font_outline_color"));
 
 	line_spacing = get_theme_constant(SNAME("line_spacing"));
+	if (text.get_line_height() + line_spacing < 1) {
+		WARN_PRINT("Line height is too small, please increase font_size and/or line_spacing");
+	}
 
 	background_color = get_theme_color(SNAME("background_color"));
 	current_line_color = get_theme_color(SNAME("current_line_color"));
@@ -3470,7 +3473,7 @@ int TextEdit::get_line_width(int p_line, int p_wrap_index) const {
 }
 
 int TextEdit::get_line_height() const {
-	return text.get_line_height() + line_spacing;
+	return MAX(text.get_line_height() + line_spacing, 1);
 }
 
 int TextEdit::get_indent_level(int p_line) const {