diff options
| -rw-r--r-- | src/GipfelWidget.cxx | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/GipfelWidget.cxx b/src/GipfelWidget.cxx index e80d94c..591e4eb 100644 --- a/src/GipfelWidget.cxx +++ b/src/GipfelWidget.cxx @@ -521,7 +521,11 @@ GipfelWidget::get_tilt_angle() { double GipfelWidget::get_focal_length_35mm() { - return pan->get_scale() * 35.0 / (double) img->w(); + if (img == NULL) { + return NAN; + } else { + return pan->get_scale() * 35.0 / (double) img->w(); + } } double |