Update app.py

app.py

@@ -67,7 +67,7 @@ class Chatbot():
             # y_diff and font_size_diff are used to separate paragraphs into different elements in the paper_text list by
             # checking the y coordinate and the font size of the current text element and comparing it to the previous text element
             for idx, t in enumerate(page_text):
-                if prev_y is None:
+                if prev_y is not None and prev_font_size is not None:
                     y_diff = abs(t['y'] - prev_y)
                     font_size_diff = abs(t['fontsize'] - prev_font_size)
                     
@@ -82,7 +82,9 @@ class Chatbot():
                             'page': i
                         })
                         paragraph = ''
-                    
+                    else:
+                        y_diff = 0
+                        font_size_diff = 0
                     # Add text to paragraph, and update the variables.
                     paragraph += f" {t['text']}"
                     prev_y = t['y']