Not allowing to click on more spaced string in behat+mink

Please find below HTML code. In this code there is more space for the agile/scrum text.

I tried by executing with space and without space

And I Press "Agile / Scrum"
And I Press "              Agile / Scrum            "
When I click "              Agile / Scrum            "

Below are the error message….

Fatal error: Call to a member function doubleClick() on a non-object in C:\behat\Regression\features\bootstrap\FeatureContext.php on line 374

When I click "              Agile / Scrum            " # FeatureContext::assertClick()
  Link with id|title|alt|text "              Agile / Scrum            " not found.

Please give some suggestion.Thanks in advance.