Stop PDFs crashing on Gravity Forms before 2.8.2 when a field leaves a gap in its row (6.18.0)

CHANGELOG.md

@@ -61,6 +61,7 @@
 * 🐞 Bug: Stop the code inside `<script>` elements showing as text in the PDF
 * 🐞 Bug: Don't leave PDF generation filters attached when a PDF fails to generate
 * 🐞 Bug: Stop bypassing Populate Anything's live merge tag whitelist after a PDF is generated
+* 🐞 Bug: Stop PDFs crashing on Gravity Forms before 2.8.2 when a field leaves a gap in its row
 * 🐞 Bug: Use the form's description placement for Consent fields set to "Use Form Setting"
 * 🐞 Bug: Show every accepted agreement for Gravity Wiz Terms of Service fields with more than one checkbox
 * 💻 Developer: Add `GPDFAPI::get_pdf_url()` to get the URL to an entry's PDF, optionally signed

src/Helper/Helper_Field_Container_Gf25.php

@@ -66,6 +66,13 @@ public function generate( GF_Field $field ) {
 
 		/* Mark as the end of this row if Gravity Forms would insert a spacer */
 		if ( ! empty( $field->layoutSpacerGridColumnSpan ) ) {
+			/* Before Gravity Forms 2.8.2 (no get_row_spacer()), every field with a spacer value got a spacer */
+			if ( ! method_exists( '\GFFormDisplay', 'get_row_spacer' ) ) {
+				$this->end_of_row = true;
+
+				return;
+			}
+
 			$gform = \GPDFAPI::get_form_class();
 			$form  = $gform->get_form( $field->form_id );