Origin:
https://sourceforge.net/p/mcj/tickets/187/
https://sourceforge.net/p/mcj/fig2dev/ci/1e5515a1ea2ec8651cf85ab5000d026bb962492a/

--- a/fig2dev/dev/genpict2e.c
+++ b/fig2dev/dev/genpict2e.c
@@ -3,7 +3,7 @@
  * Copyright (c) 1991 by Micah Beck
  * Parts Copyright (c) 1985-1988 by Supoj Sutanthavibul
  * Parts Copyright (c) 1989-2015 by Brian V. Smith
- * Parts Copyright (c) 2015-2023 by Thomas Loimer
+ * Parts Copyright (c) 2015-2025 by Thomas Loimer
  *
  * Any party obtaining a copy of these files is granted, free of charge, a
  * full and unrestricted irrevocable, world-wide, paid up, royalty-free,
@@ -19,7 +19,7 @@
 /*
  * genpict2e.c: convert fig to pict2e macro language for LaTeX
  *
- * Author: Thomas Loimer, 2014-2023
+ * Author: Thomas Loimer, 2014-2025
  * Based on the latex picture driver, genlatex.c
  *
  */
@@ -2277,8 +2277,13 @@
 	l->join_style = MITERJOIN;
 
 	p = l->points;
-	if (p == NULL)
+	for (i = 0; i < 8 && p != NULL; ++i)
+		p = p->next;
+	/* If the radius is about 1, the spline may consist of
+	   a few points only. */
+	if (i < 7)
 		return;
+	p = l->points;
 
 	/*
 	 * Walk along the spline, until the arc angle is covered.
@@ -2428,7 +2433,7 @@
 	rad = 0.5*(sqrt((double)d1x*d1x + (double)d1y*d1y)
 			+ sqrt((double)d2x*d2x + (double)d2y*d2y));
 	rad = round(rad*10.0) / 10.0;
-	/* how precise must the angle be given? 
+	/* how precise must the angle be given?
 	   1/rad is the view angle of one pixel */
 	da = 180.0 / M_PI / rad;
 	preca = 0;