SLS fluid tank plastic fitting to metal line leak

Is there an o-ring that is supposed to be in there? The fluid is leaking out of this fitting where it meets the plastic cap inlet (in the attached photo the shadow around the vertical portion doesn't really show the wetness, but you can see where it leaked down to the cap). Otherwise, is this dribbling normal? I hope not.

Is there an o-ring that is supposed to be in there? The fluid is leaking out of this fitting where it meets the plastic cap inlet (in the attached photo the shadow around the vertical portion doesn't really show the wetness, but you can see where it leaked down to the cap).

Otherwise, is this dribbling normal? I hope not.

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