Laravel migration [ErrorException] Undefined index: index_type

I'm trying to migrate my laravel project.

But When I enter migrate command I'm getting this error.I didn't understand why its giving me this error when I'm trying to migrate my project.

[ErrorException]             
  Undefined index: index_type  



Exception trace:
 () at /var/www/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/MySqlSchemaManager.php:75
 Illuminate\Foundation\Bootstrap\HandleExceptions->handleError() at /var/www/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/MySqlSchemaManager.php:75
 Doctrine\DBAL\Schema\MySqlSchemaManager->_getPortableTableIndexesList() at /var/www/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php:193
 Doctrine\DBAL\Schema\AbstractSchemaManager->listTableIndexes() at /var/www/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php:286
 Doctrine\DBAL\Schema\AbstractSchemaManager->listTableDetails() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Schema/Grammars/Grammar.php:320
 Illuminate\Database\Schema\Grammars\Grammar->getChangedDiff() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Schema/Grammars/Grammar.php:302
 Illuminate\Database\Schema\Grammars\Grammar->compileChange() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Schema/Blueprint.php:107
 Illuminate\Database\Schema\Blueprint->toSql() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Schema/Blueprint.php:82
 Illuminate\Database\Schema\Blueprint->build() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Schema/Builder.php:229
 Illuminate\Database\Schema\Builder->build() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Schema/Builder.php:130
 Illuminate\Database\Schema\Builder->table() at /var/www/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:237
 Illuminate\Support\Facades\Facade::__callStatic() at /var/www/database/migrations/2016_10_25_222438_update_relationships_for_employee.php:20
 Illuminate\Support\Facades\Schema::table() at /var/www/database/migrations/2016_10_25_222438_update_relationships_for_employee.php:20
 UpdateRelationshipsForEmployee->up() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:373
 Illuminate\Database\Migrations\Migrator->Illuminate\Database\Migrations\{closure}() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:380
 Illuminate\Database\Migrations\Migrator->runMigration() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:162
 Illuminate\Database\Migrations\Migrator->runUp() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:130
 Illuminate\Database\Migrations\Migrator->runMigrationList() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Migrations/Migrator.php:97
 Illuminate\Database\Migrations\Migrator->run() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Console/Migrations/MigrateCommand.php:66
 Illuminate\Database\Console\Migrations\MigrateCommand->fire() at n/a:n/a
 call_user_func_array() at /var/www/vendor/laravel/framework/src/Illuminate/Container/Container.php:508
 Illuminate\Container\Container->call() at /var/www/vendor/laravel/framework/src/Illuminate/Console/Command.php:169
 Illuminate\Console\Command->execute() at /var/www/vendor/symfony/console/Command/Command.php:256
 Symfony\Component\Console\Command\Command->run() at /var/www/vendor/laravel/framework/src/Illuminate/Console/Command.php:155
 Illuminate\Console\Command->run() at /var/www/vendor/laravel/framework/src/Illuminate/Console/Command.php:185
 Illuminate\Console\Command->call() at /var/www/vendor/laravel/framework/src/Illuminate/Database/Console/Migrations/RefreshCommand.php:66
 Illuminate\Database\Console\Migrations\RefreshCommand->fire() at n/a:n/a
 call_user_func_array() at /var/www/vendor/laravel/framework/src/Illuminate/Container/Container.php:508
 Illuminate\Container\Container->call() at /var/www/vendor/laravel/framework/src/Illuminate/Console/Command.php:169
 Illuminate\Console\Command->execute() at /var/www/vendor/symfony/console/Command/Command.php:256
 Symfony\Component\Console\Command\Command->run() at /var/www/vendor/laravel/framework/src/Illuminate/Console/Command.php:155
 Illuminate\Console\Command->run() at /var/www/vendor/symfony/console/Application.php:820
 Symfony\Component\Console\Application->doRunCommand() at /var/www/vendor/symfony/console/Application.php:187
 Symfony\Component\Console\Application->doRun() at /var/www/vendor/symfony/console/Application.php:118
 Symfony\Component\Console\Application->run() at /var/www/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php:121
 Illuminate\Foundation\Console\Kernel->handle() at /var/www/artisan:36

via Chebli Mohamed