Am 23.05.2016 um 23:07 schrieb C R:
Yes, if "save comment" is unchecked it saves fine.
I never touch the comment, so it's strange that there would be something invalid in it.

Thanks for looking into this.
Maybe we should create a bug report?

You have precedence. You know, I'm just a packager. :-P

In German: Bitte nach Ihnen.

But seriously: From where you got this picture? Please explain the entire workflow from your camera.

IMHO information like this is very important in order to handle issues like that:

This comes from exiftooll. The whole thing is here.

*exiftool ac_a4_document_holder_vintage_leather_brown_4..png**
**ExifTool Version Number         : 10.10**
**File Name : ac_a4_document_holder_vintage_leather_brown_4..png**
**Directory                       : .**
**File Size                       : 1631 kB**
**File Modification Date/Time     : 2016:05:23 23:28:11+02:00**
**File Access Date/Time           : 2016:05:23 23:29:26+02:00**
**File Inode Change Date/Time     : 2016:05:23 23:28:27+02:00**
**File Permissions                : rw-rw-r--**
**File Type                       : PNG**
**File Type Extension             : png**
**MIME Type                       : image/png**
**Image Width                     : 1000**
**Image Height                    : 1000**
**Bit Depth                       : 8**
**Color Type                      : RGB with Alpha**
**Compression                     : Deflate/Inflate**
**Filter                          : Adaptive**
**Interlace                       : Noninterlaced**
**Exif Byte Order                 : Little-endian (Intel, II)**
**Bits Per Sample                 : 8 8 8**
**Image Description               : ..:\w�**
**Make                            : samsung**
**Camera Model Name               : SM-N910F**
**Orientation                     : Horizontal (normal)**
**X Resolution                    : 72**
**Y Resolution                    : 72**
**Resolution Unit                 : inches**
**Software                        : GIMP 2.9.3**
**Y Cb Cr Positioning             : Centered**
**Exposure Time                   : 1/100**
**F Number                        : 2.2**
**Exposure Program                : Program AE**
**ISO                             : 50**
**Exif Version                    : 0220**
**Date/Time Original              : 2016:04:08 09:51:31**
**Create Date                     : 2016:04:08 09:51:31**
**Components Configuration        : Y, Cb, Cr, -**
**Shutter Speed Value             : 1/100**
**Aperture Value                  : 2.2**
**Brightness Value                : 4.61**
**Exposure Compensation           : -1/2**
**Max Aperture Value              : 2.2**
**Metering Mode                   : Center-weighted average**
**Light Source                    : Unknown**
**Flash                           : No Flash**
**Focal Length                    : 4.8 mm**
**User Comment                    : ..:\w�**
**Flashpix Version                : 0100**
**Color Space                     : sRGB**
**Exif Image Width                : 5312**
**Exif Image Height               : 2988**
**Sensing Method                  : One-chip color area**
**Scene Type                      : Directly photographed**
**Exposure Mode                   : Auto**
**White Balance                   : Auto**
**Focal Length In 35mm Format     : 31 mm**
**Scene Capture Type              : Standard**
**Image Unique ID                 : H16USHH04SA**
**GPS Version ID                  : 2.2.0.0**
**Photometric Interpretation      : YCbCr**
**Samples Per Pixel               : 3**
**Thumbnail Offset                : 884**
**Thumbnail Length                : 14883**
**Date Created                    : 2016:05:23**
**Time Created                    : 07:46:21-07:46**
**XMP Toolkit                     : XMP Core 4.4.0-Exiv2**
**Format                          : image/png**
**Background Color                : 255 255 255**
**Pixels Per Unit X               : 2835**
**Pixels Per Unit Y               : 2835**
**Pixel Units                     : meters**
**Modify Date                     : 2016:05:23 06:46:23**
**Aperture                        : 2.2**
**Date/Time Created               : 2016:05:23 07:46:21-07:46**
**Image Size                      : 1000x1000**
**Megapixels                      : 1.0**
**Scale Factor To 35 mm Equivalent: 6.5**
**Shutter Speed                   : 1/100**
**Thumbnail Image : (Binary data 14883 bytes, use -b option to extract)**
**Circle Of Confusion             : 0.005 mm**
**Field Of View                   : 60.3 deg**
**Focal Length                    : 4.8 mm (35 mm equivalent: 31.0 mm)**
**Hyperfocal Distance             : 2.25 m**
**Light Value                     : 9.9**
**
**.**
*

-C

On Mon, May 23, 2016 at 6:59 PM, Thorsten Stettin <thorsten.stet...@gmail.com> wrote:

    Am 23.05.2016 um 15:00 schrieb C R:

        Happens every time with this file:
        
http://www.whitecatgraphics.com/opendesignstudio/gimp/samples/ac_a4_document_holder_vintage_leather_brown_4.png

        steps to reproduce:
        1.open the downloaded file in gimp
        2.export as "ac_a4_document_holder_vintage_leather_brown_4a.png"
        3.these boxes in png export are checked: "save background
        colour", and all checkboxes after and including Save
        resolution, compression level 9, and everything under advanced
        checked.


    Hi

    At home in Xenial I exported your picture with save comment.
    The above error occurred.
    Hmm.

    I took a look at the comment field exactly the
    exif:ImageDescription: It contains an invalid UTF-8 string.

    *identify -verbose
    ac_a4_document_holder_vintage_leather_brown_4.png | grep -i desc **
    **    exif:ImageDescription: ..:\w.*


    After replacing the picture comment content with Gimp's standard
    one - valid UTF-8, I think - I could export your picture without
    any problem.

    *identify -verbose
    ac_a4_document_holder_vintage_leather_brown_4a.png | grep -i desc
        exif:ImageDescription: Created with GIMP*

    I guess it's a bug regarding the comment string and/or character
    set handling. Maybe a wrong character set was using in the
    exif:ImageDescription field, I assume.


    Greetings

    Thorsten


        On Mon, May 23, 2016 at 11:24 AM, Thorsten Stettin
        <thorsten.stet...@gmail.com <mailto:thorsten.stet...@gmail.com
        <mailto:thorsten.stet...@gmail.com>>> wrote:

            Am 23.05.2016 um 08:44 schrieb C R:
            > Fails on export with a Plug-in crash:
            >
            > "Procedure 'file-png-save-defaults' returned no return
        values
            >
            >
            > Strangely, if you save as a jpeg first, it exports to
        png just fine.
            >
            > Steps to reproduce:
            > 1. Open File
            > 2. Export to png
            >
            > Results in the above crash.
            >
            > Ver: GIMP 2.9.3
            > Ubuntu 16.04 with gnome-shell 3.18.4
            >
            > -C
            Under Trusty I can't reproduce that behavior. :-(

            gimp Version 2.9.3.81-0t0~ppa
            libgegl-0.3-0 1:0.3.6.20-0t0~ppa

            Cheers

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-- Lao-Tse sagt: Nichtstun ist besser, als mit viel Mühe nichts zu
    schaffen.
    Und er sagt auch: Ich habe drei Schätze, die ich hüte und hege.
    Der eine ist die Liebe, der zweite ist die Genügsamkeit, der
    dritte ist die Demut.
    Nur der Liebende ist mutig, nur der Genügsame ist großzügig, nur
    der Demütige ist fähig zu herrschen.

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--
Lao-Tse sagt: Nichtstun ist besser, als mit viel Mühe nichts zu schaffen.
Und er sagt auch: Ich habe drei Schätze, die ich hüte und hege.
Der eine ist die Liebe, der zweite ist die Genügsamkeit, der dritte ist die 
Demut.
Nur der Liebende ist mutig, nur der Genügsame ist großzügig, nur der Demütige 
ist fähig zu herrschen.

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