grunt-contrib-imagemin: Fatal error: Cannot read property 'contents' of undefined

i am getting that error after run: grunt imagemin

Running “imagemin:dist” (imagemin) task Fatal error: Cannot read property ‘contents’ of undefined

the funnest part is: i am using the same code and images from other project for test and in that projects everything works perfect. \o/ i tried use --force but keeps the same error, the task minimize one image but not all.

my gruntfile.js //Image min ===============================

            var imagemin;
            config.imagemin = imagemin = {};

                imagemin.dist = {
                              options: {
                              optimizationLevel: 5,
                              progressive: true,
                          },

                        files: [{
                            expand: true,
                            cwd: 'public/images/',
                            src: ['**/*.{png,jpg,gif}'],
                            dest: 'public/images/min'
                        }]
                 };

About this issue

Original URL
State: closed
Created 9 years ago
Comments: 93

Commits related to this issue

fix imaginmin version for issue https://github.com/gruntjs/grunt-contrib-imagemin/issues/330 — committed to Conf4IT/devopsconf by rodgaray 9 years ago
Merge pull request #329 from sapegin/patch-1 Update imagemin to 4.0.0 r=vladikoff — committed to gruntjs/grunt-contrib-imagemin by vladikoff 9 years ago
Update Fixes recent imagemin bug, see https://github.com/gruntjs/grunt-contrib-imagemin/issues/330 — committed to TryKickoff/kickoff by mrmartineau 9 years ago
Merge branch 'next' of https://github.com/TryKickoff/kickoff into next # By Zander Martineau (3) and others * 'next' of https://github.com/TryKickoff/kickoff: remove html validation grunt task ad... — committed to TryKickoff/kickoff by mrmartineau 9 years ago
Workaround for image minification regression Added workaround fix for regression introduced into image minification build task as discussed here: https://github.com/gruntjs/grunt-contrib-imagemin/is... — committed to rgladwell/generator-simple-static-site by rgladwell 8 years ago
Locks grunt-contrib-imagemin version This commit fixes grunt-contrib-imagemin version in order to fix build errors in newer versions of npm. This commit also adds package-lock.json to .gitignore, si... — committed to sing-group/pandrugs-frontend by lipido 6 years ago

Most upvoted comments

I resolved this by bumping grunt-contrib-imagemin in package.json to ^1.0.0, then givin’ it the ol’ npm cache clean && npm install grunt-contrib-imagemin.

+37

sh78 on Mar 15, 2016

this fixes this issue… https://github.com/gruntjs/grunt-contrib-imagemin/pull/329 let’s see how long until it gets merged, in the meantime for those who need to deploy you can create a post install script to run the library update with

#! /usr/bin/env bash
cd node_modules/grunt-contrib-imagemin
npm install imagemin@4.0.0

sergioadorna on Nov 9, 2015

Delete node_modules
Change package.json to use "grunt-contrib-imagemin": "1.0.0" and "vinyl-fs": "2.3.1"
Do npm install

That’s what did it for me.

lashan on Jan 15, 2016

@lashan These steps worked for me.

son1112 on Apr 4, 2016

npm i -D imagemin vinyl-fs@2.2.1 works for me.

Scrum on Jan 13, 2016

Adding "vinyl-fs": "2.2.1"as devDepenency fixed the problem for me.

warpdesign on Jan 12, 2016

Same for me, everything works in an outdated version, but if I run npm install and use new updates will get this error…

I think is something related to the function used to calculate size differences between source and output files.

It works if I check for undefined data[0] in this anonymous function: node_modules/grunt-contrib-imagemin/tasks/imagemin.js:48

the “fix” since the image size difference still won’t be calculated:

if (data[0] === undefined) {
    grunt.warn('could not calculate size difference' + ' in file ' + file.src[0]);
    return next();
}

the anonymous callback function to put the fix:

fs.stat(file.src[0], function (err, stats) {
                if (err) {
                    grunt.warn(err + ' in file ' + file.src[0]);
                    return next();
                }

                imagemin.run(function (err, data) {
                    console.log(arguments);
                    if (err) {
                        grunt.warn(err + ' in file ' + file.src[0]);
                        return next();
                    }

                    var origSize = stats.size;
                    var diffSize = origSize - data[0].contents.length;

                    totalSaved += diffSize;

                    if (diffSize < 10) {
                        msg = 'already optimized';
                    } else {
                        msg = [
                            'saved ' + prettyBytes(diffSize) + ' -',
                            (diffSize / origSize * 100).toFixed() + '%'
                        ].join(' ');
                    }

                    grunt.verbose.writeln(chalk.green('✔ ') + file.src[0] + chalk.gray(' (' + msg + ')'));
                    process.nextTick(next);
                });
            });

Guess why data argument is undefined when err is null I think is the key to really fix this…

sergioadorna on Nov 9, 2015