diff --git a/page_splitter.py b/page_splitter.py
index 34d5536..1e51da3 100644
--- a/page_splitter.py
+++ b/page_splitter.py
@@ -362,12 +362,14 @@ class PDFPreviewer:
                 rect_left = fitz.Rect(0, 0, line_x, page.rect.height)
             else:
                 rect_left = fitz.Rect(page.rect.width-line_x, 0, page.rect.width, page.rect.height)
-            doc_left = fitz.open()
-            page_left = doc_left.new_page(width=rect_left.width, height=rect_left.height)
-            page_left.show_pdf_page(page_left.rect, self.doc, i, clip=rect_left)
-            page_left.set_rotation(rotation)
 
-            if keep == "both" or keep == "left":
+            if (keep == "both" or keep == "left") and line_x > 0:
+
+                doc_left = fitz.open()
+                page_left = doc_left.new_page(width=rect_left.width, height=rect_left.height)
+                page_left.show_pdf_page(page_left.rect, self.doc, i, clip=rect_left)
+                page_left.set_rotation(rotation)
+
                 output_path_left = self.split_filename_left(i)
                 doc_left.save(output_path_left)
                 doc_left.close()
@@ -377,12 +379,11 @@ class PDFPreviewer:
                 rect_right = fitz.Rect(line_x, 0, page.rect.width, page.rect.height)
             else:
                 rect_right = fitz.Rect(0, 0, page.rect.width-line_x, page.rect.height)
-            doc_right = fitz.open()
-            page_right = doc_right.new_page(width=rect_right.width, height=rect_right.height)
-            page_right.show_pdf_page(page_right.rect, self.doc, i, clip=rect_right)
-            page_right.set_rotation(rotation)
-
-            if keep == "both" or keep == "right":
+            if (keep == "both" or keep == "right") and line_x < page.rect.width:
+                doc_right = fitz.open()
+                page_right = doc_right.new_page(width=rect_right.width, height=rect_right.height)
+                page_right.show_pdf_page(page_right.rect, self.doc, i, clip=rect_right)
+                page_right.set_rotation(rotation)
                 output_path_right = self.split_filename_right(i)
                 doc_right.save(output_path_right)
                 doc_right.close()