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Controlled point-like disorder introduced by 2.5 MeV electron irradiation wasused to probe the superconducting state of single crystals of \CaKx\superconductor at $x = 0$ and 0.05 doping levels. Both compositions show anincrease of the residual resistivity and a decrease of the superconductingtransition temperature, $T_c$ at the rate of $dT_c/d\rho(T_c) \approx$ 0.19K(\textmu$\Omega$cm)$^{-1}$ for $x=0$ and 0.38 K(\textmu$\Omega$cm)$^{-1}$ for$x=\:$0.05, respectively. In Ni - doped, $x = 0.05$, compound the coexistingspin-vortex crystal (SVC) magnetic phase is suppressed at the rate of$dT_N/d\rho(T_N)\approx$ 0.16 K(\textmu$\Omega$cm)$^{-1}$. Low - temperaturevariation of London penetration depth is well approximated by the power law,$\Delta \lambda (T) = AT^n$ with $n\approx\,$2.5 for $x=0$ and $n\approx\,$1.9for $x=0.05$ in the pristine state. Electron irradiation leads to the exponent$n$ increase above 2 in $x=0.05$ suggesting superconducting gap withsignificant anisotropy that is smeared by the disorder scattering. Detailedanalysis of $\lambda (T)$ and $T_{c}$ evolution with disorder is consistentwith two effective nodeless superconducting energy gaps due to robust s$_{\pm}$pairing. Overall the behavior of \CaKx\ at $x = 0$ is similar to a slightlyoverdoped \BaK\ at $y \approx$ 0.5 and at $x= 0.05$ to an underdopedcomposition at $y \approx$ 0.2.

Robust s+/- pairing in CaK[Fe(1-x)Ni(x)]4As4$ (x = 0 and 0.05) from the response to electron irradiation